mine crashes too,
upon trying to send 1 GRC in win7 64bit the wallet terminates stating:
"MS Visual C++
This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information."
Retry @ 1 mGRC failed as well.

is there already a pending request to integrate some stable version of boinc?
this might strip dependencies and make the system less vulnerable.