using revision 8538 of FLTK 1.3 for my app (prodatum.sf.net) that was build for 
1.1.10 i'm having no problems compiling and linking with the new version but 
the program keeps crashing when tooltips are enabled. i just hover my mouse 
over some widgets to trigger the tooltips and after 1 or 2 or 10 of them 
popping up the app gets killed by the OS.


2011-03-27 14:46:47.065 prodatum[76355:307] *** Assertion failure in -[FLWindow 
setTitle:], /SourceCache/AppKit/AppKit-1038.35/AppKit.subproj/NSWindow.m:2036
2011-03-27 14:46:47.068 prodatum[76355:307] An uncaught exception was raised
2011-03-27 14:46:47.068 prodatum[76355:307] Invalid parameter not satisfying: 
aString != nil
2011-03-27 14:46:47.070 prodatum[76355:307] *** Terminating app due to uncaught 
exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not 
satisfying: aString != nil'
*** Call stack at first throw:
(
        0   CoreFoundation                      0x92b2e6ba __raiseError + 410
        1   libobjc.A.dylib                     0x973f9509 objc_exception_throw 
+ 56
        2   CoreFoundation                      0x92b2e3e8 +[NSException 
raise:format:arguments:] + 136
        3   Foundation                          0x94390ae7 -[NSAssertionHandler 
handleFailureInMethod:object:file:lineNumber:description:] + 116
        4   AppKit                              0x92e3565d -[NSWindow 
setTitle:] + 156
        5   prodatum                            0x000cdd62 
_ZL18q_set_window_titleP8NSWindowPKc + 82
        6   prodatum                            0x000cee39 
_ZN4Fl_X4makeEP9Fl_Window + 1065
        7   prodatum                            0x0010b536 
_ZL15tooltip_timeoutPv + 182
        8   prodatum                            0x000cdf1b 
_ZL8do_timerP16__CFRunLoopTimerPv + 75
        9   CoreFoundation                      0x92a98adb __CFRunLoopRun + 8059
        10  CoreFoundation                      0x92a96464 CFRunLoopRunSpecific 
+ 452
        11  CoreFoundation                      0x92a96291 CFRunLoopRunInMode + 
97
        12  HIToolbox                           0x9060ce04 
RunCurrentEventLoopInMode + 392
        13  HIToolbox                           0x9060cbb9 
ReceiveNextEventCommon + 354
        14  HIToolbox                           0x9060ca3e 
BlockUntilNextEventMatchingListInMode + 81
        15  AppKit                              0x92de278d _DPSNextEvent + 847
        16  AppKit                              0x92de1fce -[NSApplication 
nextEventMatchingMask:untilDate:inMode:dequeue:] + 156
        17  prodatum                            0x000cfd01 _Z7fl_waitd + 177
        18  prodatum                            0x000cfdde 
_Z21fl_mac_flush_and_waitdc + 126
        19  prodatum                            0x000d6220 _ZN2Fl4waitEd + 96
        20  prodatum                            0x000d6344 _ZN2Fl3runEv + 52
        21  prodatum                            0x000c6070 main + 1149
        22  prodatum                            0x00004005 start + 53
)


let me know if you need any more information
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