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This is very strange, and not too surprising that your performance is low when your D3D device is getting reset so often. Can you try updating your graphics drivers?
Still working on fixing this one. I have yet to be able to reproduce it here, but I know many of you are   experiencing it. I appreciate the feedback in trying to track this down. I hope to have it fixed for 0.4.4.
I will be releasing a Mac version of Crashtastic in a few weeks, so you shouldn't have this problem for long!
Hi! If you are still experiencing issues, please send your output_log.txt file from your crashtastic_data directory to support@crashtastic.com, and I will work on getting you going!

Mark
I believe this issue is related to the extra piece on save issue. I have fixed this in 0.4.4 
This is fixed in 0.4.4
This was fixed in 0.4.3. Old designs will see the extra brick I will fix that issue next patch.

The extra brick issue is fixed in 0.4.4
Can you provide some stats? 

CPU
GPU
Frame rate with 50 piece design?
Crashtastic requires a good CPU to play.
Yeah, there is a bug with this level, where the finish line is not in the correct location. I have fixed this, and it will be available in the next release.

Mark