Public bug reported:

Binary package hint: gtk-qt-engine

After realizing I couldn't open any GTK apps, I ran the command
"firefox" in Konsole and this was its output:

~$ firefox
QPainter::begin: Cannot paint null pixmap
QPainter::setPen: Will be reset by begin()
QPainter::setFont: Will be reset by begin()
QPainter::end: Missing begin() or begin() failed
The program 'firefox-bin' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadValue (integer parameter out of range for operation)'.
  (Details: serial 449 error_code 2 request_code 53 minor_code 0)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)


I opened Konqueror (opened fine) and searched kubuntuforum.org for an any posts 
regarding this error, and found the below:
http://kubuntuforums.net/forums/index.php?topic=3082114.msg64797#msg64797

Following the instruction posted, I uninstalled the gtk-qt-engine
package, ran the "firefox" command in Konsole again, and, VOILA, Firefox
opened.

This apparently isn't a new bug, just it hasn't been reported before.
My GTK apps look like mess without the gtk-qt-engine installed, but I'm
just happy they run.

** Affects: gtk-qt-engine (Ubuntu)
     Importance: Undecided
         Status: New

-- 
gtk-qt-engine prevents GTK apps from opening
https://bugs.launchpad.net/bugs/157962
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