ESRI released a new build of ArcGIS Mobile 10, they said it fixes a lot of crashing with the mobile version.
I have yet to try this build, because my boss has stated to continue to develope on the Tablet version, instead of the Mobile platform.
Go back to your ESRI downloads and you should see a new build release for it.
I hope everything turns out ok aftewards, please let me know.
Thanks,
Akhil P.