Program crash after trying to load a drum set.

On a windows xp machine with musescore 0.9.5.
I managed to change the drumsetnotationsetting so that under the A key I could create the Hihats, under the B the bassdrums etc. Then in the same menu (edit drumset) I saved those settings.

Then created a new empty score for drums en rightclicking on a bar went to Edit Drumset.
Then I tried to load the drumset I had saved before. That's when musecore crashed.

The same procedure I followed on a linux Ubuntu Hardy PC with Musescore 0.9.5.
That gave first an other problem.
Same procedure as above, saving the drumset settings and gave it a name "drumsnotation"
After trying to load that in a new score the map seemed to be empty.

Then I compared it with the XP version and found: When saving the drumset windwons (or mscore?) automatically gives the right extension "drm" after the name of the file.
At the linux version this doens't happen automatically and you can't see in that window what the extension should be.
So I tried it again with saving the file as "drumsnotation.drm" and then I could find the file when trying to load it.
Unfortenately, then the same happened as on the xp machine: Musescore was gone!
Same problem on different systems? That''s a bug I guess.