Crash notifier appears when launching mypaint

[Mark Fraser]

When I start mypaint in Kubuntu 12.04, a crash notifier appears saying that mypaint has crashed even though it is still running. I did a search on the Internet and came across this page:
http://forum.intilinux.com/mypaint-help-and-tips/%28kubuntu-linux%29-mypaint-crashes-immediately-after-launch/
If I remove the files mamurk_b_1.png & mamurk_b_2.png from /usr/share/mypaint/backgrounds/mrmamurk mypaint will now launch without crashing.

Description: Ubuntu 12.04.1 LTS
Release: 12.04

mypaint:
Installed: 1.0.0-1
  Candidate: 1.0.0-1
  Version table:
 *** 1.0.0-1 0
        500 http://gb.archive.ubuntu.com/ubuntu/ precise/universe i386 Packages
        100 /var/lib/dpkg/status

mypaint-data:
  Installed: 1.0.0-1
  Candidate: 1.0.0-1
  Version table:
 *** 1.0.0-1 0
        500 http://gb.archive.ubuntu.com/ubuntu/ precise/universe i386 Packages
        100 /var/lib/dpkg/status

[Mark Fraser (launchpad-mfraz)]

It is now showing the crash notifier even though those files have been removed.

[Andrew Chadwick (achadwick)]

I've updated background error handling in master so it'll be less irritating in situations like these, and there will be a new PPA build available shortly at https://launchpad.net/~achadwick/+archive/mypaint-testing. Guess we need to build for Quantal now too!

Without knowing what new error message is being shown by the crash notifier, I can't help you with the new problem. I would suggest double-checking your libgdkpixbuf installation, which means ensuring that the right loader library is understood for PNGs by running

    $ gdk-pixbuf-query-loaders | less

and searching for a snippet like (Debian machine):

    "/usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders/libpixbufloader-png.so"
    "png" 5 "gdk-pixbuf" "The PNG image format" "LGPL"
    "image/png" ""
    "png" ""
    "\211PNG\r\n\032\n" "" 100

If necessary, rebuild the loader cache by running

    $ sudo gdk-pixbuf-query-loaders --update-cache

I'm not certain why we use the term "crash". Perhaps it's because it's more widely understood than "handled exception".

[Mark Fraser (launchpad-mfraz)]

Had to install libgdk-pixbuf2.0-dev, but here is the output of gdk-pixbuf-query-loaders:

"/usr/lib/i386-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders/libpixbufloader-png.so"
"png" 5 "gdk-pixbuf" "The PNG image format" "LGPL"
"image/png" ""
"png" ""
"\211PNG\r\n\032\n" "" 100

Oddly, I can't get it to crash now.

Will investigate further.