Did you check out the [FAQ] Troubleshooting Dragon Commander & support topic?

If it crashes entering the Training Grounds:
Originally Posted by Larian_QA
2) When going to combat, the game crashes

Temporary solution A: Set your graphics settings to medium or lower. Texture quality should be medium or lower.

Temporary solution B: if you are playing on a laptop with both intel HD onboard graphics and a mobile graphics card, set your preferred graphics processor to the NVIDIA or AMD card instead of onboard intel.
http://lnv.gy/19KJdI6

If the issue persists, send a mail to supportdc@larian.com