Caused by assistant files being automatically named, but the paths that
point to them not.
This would cause crashes when clicking assistants.
This does not work backwardly.

To fix:
1. Open .kra as zip.
2. Open maindoc.xml in notepad or other simple text editor.
3. Find the assistant element.
4. Replace all underscores with spaces in attribute filename:
<assistant type="vanishing point"
filename="vanishing_point0.assistant"/>
becomes
<assistant type="vanishing point" filename="vanishing
point0.assistant"/>
5. save, confirm saving in zip.
6. Open and enjoy.

My sincere apologies this happened, I did not expect there to be two
different methods for the same string.
todo: Actually use same kind of method.

CCMAIL:kimageshop@kde.org