Nothing like posting a question to trigger stumbling across the solution. It appears that a solution was found back in the Summer in this thread: https://www.mail-archive.com/qgis-user@lists.osgeo.org/msg40317.html
I tried adding this and both of the problems seem to have gone - although I still did get an exception when I exited the bare bones standalone python code. export QT_QPA_PLATFORM_PLUGIN_PATH="/Applications/QGIS3.app/Contents/Plugins" John Hello, Now that QGIS3 is well underway I’ve been looking at getting some Python3 code working with QGIS as standalone and plugins apps. But I have two - possibly related persistent problems with QGIS3 and this list was suggested as a good place to ask advice. I’m running 3.4 (just upgraded yesterday) on Mac OSX 10.13.6 I can work in QGIS and have been using it for ongoing work - so everything seems good until I get to quitting. Shortly after I’ve closed QGIS I get crash report (parts included below). Its a bit unclear exactly what is causing the crash - and its been happening since I went to QGIS3. I should (admit) that I was also running the beta and building that so there is a possibility that I have some left over side effects of that I have not been able to clean up. I have taken out everything I can track down on that and some other dev things (not QGIS) I was doing a year or longer ago. The other crash that may be related and seems to give more info is when I run the basic standalone app example from the PyQGIS book. The : = QgsApplication([], False) crashes with an abort trap 6 and the message: qt.qpa.plugin: Could not find the Qt platform plugin "cocoa" in “" This looks a lot like a missing path problem, but I have been unable to resolve where it is missing. As far as I can see the qt and cocoa support libraries are in the GIS3 app contents subdirectories, so I’m at a loss as to what is really missing. Any suggestions for where to go would be appreciated. John Harrop Senior Project Geologist CMG Here is a part of the crash report after closing the QGIS app. QT seems to be involved in this too - although the details are less clear to me. So I’m hoping that solving one problem will clear both.: Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: EXC_I386_GPFLT Exception Note: EXC_CORPSE_NOTIFY Termination Signal: Segmentation fault: 11 Termination Reason: Namespace SIGNAL, Code 0xb Terminating Process: exc handler [0] Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 org.qt-project.QtWidgets 0x000000011524fd6e QWidget::mapTo(QWidget const*, QPoint const&) const + 46 1 org.qgis.qgis3_gui 0x0000000110221bef QgsFloatingWidget::onAnchorPointChanged() + 375 2 org.qt-project.QtCore 0x0000000118e7053b QMetaObject::activate(QObject*, int, int, void**) + 2347 3 org.qgis.qgis3_gui 0x0000000110222027 QgsFloatingWidgetEventFilter::eventFilter(QObject*, QEvent*) + 21 4 org.qt-project.QtCore 0x0000000118e3f832 QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) + 210 5 org.qt-project.QtWidgets 0x000000011522befd QApplicationPrivate::notify_helper(QObject*, QEvent*) + 285 6 org.qt-project.QtWidgets 0x000000011522d2ed QApplication::notify(QObject*, QEvent*) + 573 7 org.qgis.qgis3_core 0x000000011127cb21 QgsApplication::notify(QObject*, QEvent*) + 93 8 org.qt-project.QtCore 0x0000000118e3f54f QCoreApplication::notifyInternal2(QObject*, QEvent*) + 159 9 org.qt-project.QtWidgets 0x0000000115286ec7 0x11521c000 + 437959 10 org.qt-project.QtWidgets 0x000000011528512d 0x11521c000 + 430381 11 org.qt-project.QtWidgets 0x000000011522bf12 QApplicationPrivate::notify_helper(QObject*, QEvent*) + 306 12 org.qt-project.QtWidgets 0x000000011522d2ed QApplication::notify(QObject*, QEvent*) + 573 13 org.qgis.qgis3_core 0x000000011127cb21 QgsApplication::notify(QObject*, QEvent*) + 93 14 org.qt-project.QtCore 0x0000000118e3f54f QCoreApplication::notifyInternal2(QObject*, QEvent*) + 159 15 org.qt-project.QtGui 0x000000011862a1cd QGuiApplicationPrivate::processGeometryChangeEvent(QWindowSystemInterfacePrivate::GeometryChangeEvent*) + 381 16 org.qt-project.QtGui 0x000000011860f9b4 QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 404 17 org.qt-project.QtGui 0x000000011860b320 QWindowSystemInterface::flushWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 576 18 libqcocoa.dylib 0x000000011b493a65 0x11b480000 + 80485 19 org.qt-project.QtCore 0x0000000118e496dc QMetaMethod::invoke(QObject*, Qt::ConnectionType, QGenericReturnArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument) const + 1308 20 libqcocoa.dylib 0x000000011b49a06d 0x11b480000 + 106605 21 com.apple.Foundation 0x00007fff3097c640 -[__NSObserver _doit:] + 303 22 com.apple.CoreFoundation 0x00007fff2e86eedc __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12 23 com.apple.CoreFoundation 0x00007fff2e86edaa _CFXRegistrationPost + 458 24 com.apple.CoreFoundation 0x00007fff2e86eae1 ___CFXNotificationPost_block_invoke + 225 25 com.apple.CoreFoundation 0x00007fff2e82c880 -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 1664 26 com.apple.CoreFoundation 0x00007fff2e82b9b7 _CFXNotificationPost + 599 27 com.apple.AppKit 0x00007fff2be1d35b -[NSView _postFrameChangeNotification] + 314 28 com.apple.AppKit 0x00007fff2be1787b -[NSView setFrameSize:] + 2061 29 com.apple.AppKit 0x00007fff2be2db1e -[NSView setFrame:] + 371 30 com.apple.AppKit 0x00007fff2be3849c -[NSThemeFrame _relayoutAuxiliaryViewsOfType:] + 163 31 com.apple.AppKit 0x00007fff2be383e6 -[NSThemeFrame relayoutAuxiliaryViewsOfType:] + 27 32 com.apple.AppKit 0x00007fff2c163237 -[NSTitlebarViewController removeChildViewControllerAtIndex:] + 431 33 com.apple.AppKit 0x00007fff2c6522c6 -[NSWindowStackController _removeTabBarAccessoryViewControllerForWindow:] + 213 34 com.apple.AppKit 0x00007fff2c653162 -[NSWindowStackController removeWindow:] + 277 35 com.apple.AppKit 0x00007fff2c1dc97d -[NSWindow(NSWindowTabbing) _doTabbedWindowCleanupForOrderOut] + 97 36 com.apple.AppKit 0x00007fff2c6c903d __79-[NSWindow _reallyDoOrderWindowOutRelativeTo:findKey:forCounter:force:isModal:]_block_invoke + 62 37 com.apple.AppKit 0x00007fff2bf19c0c NSPerformVisuallyAtomicChange + 146 38 com.apple.AppKit 0x00007fff2c6c8cbc -[NSWindow _reallyDoOrderWindowOutRelativeTo:findKey:forCounter:force:isModal:] + 340 39 com.apple.AppKit 0x00007fff2bf218ec -[NSWindow _reallyDoOrderWindow:relativeTo:findKey:forCounter:force:isModal:] + 172 40 com.apple.AppKit 0x00007fff2bf20765 -[NSWindow _doOrderWindow:relativeTo:findKey:forCounter:force:isModal:] + 287 41 com.apple.AppKit 0x00007fff2bf205cb -[NSWindow orderWindow:relativeTo:] + 169 42 libqcocoa.dylib 0x000000011b492f79 0x11b480000 + 77689 43 org.qt-project.QtGui 0x0000000118631c63 QWindowPrivate::setVisible(bool) + 1123 44 org.qt-project.QtWidgets 0x0000000115262f56 QWidgetPrivate::hide_sys() + 214 45 org.qt-project.QtWidgets 0x0000000115265787 QWidgetPrivate::hide_helper() + 183 46 org.qt-project.QtWidgets 0x0000000115265be9 QWidget::setVisible(bool) + 281 47 org.qt-project.QtWidgets 0x0000000115255052 QWidgetPrivate::close_helper(QWidgetPrivate::CloseMode) + 290 48 org.qt-project.QtWidgets 0x0000000115254b1b QWidget::~QWidget() + 699 49 libqgis_app.3.4.0.dylib 0x000000010f37ec81 QgisApp::~QgisApp() + 2245 50 libqgis_app.3.4.0.dylib 0x000000010f37f0c2 QgisApp::~QgisApp() + 14 51 org.qgis.qgis3 0x000000010ee7d5a1 main + 22017 52 libdyld.dylib 0x00007fff566a4015 start + 1
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