Uttsc to VRDP/MSRDP session freezes on Windows 7

Hi all,
We have an educational customer who are using Sun Ray Software 5.1.2 (ie SRWC 2.3.1) on Solaris x86. They are using VirtualBox (we have tried 3.0.x, 3.2.x and 4.0.x all with the same result) running Windows 7 professional. We have tried connect to the Windows 7 VM either using MS RDP or VRDP, with the same results. The connection starts off fine, and then randomly starts freezing. The VM has not actually hung, but the RDP connection has. If we reset the DTU, we can connect back to the same VM (without rebooting it) only for it to hang again in a while.
I am not sure how relevant it is, but this error, usually happens around a freezing session.
Bankenveld05 dtlogin[933]: [ID 691260 user.notice] pam_sunray_hotdesk:pam_sm_auth: ut_getTokenByDisplay failed -1 for display :18
Any ideas ? We are about to revert to Windows XP ?
Regards,
Sean

i've seen that too a while ago. happens when you have 2 or more cpus assigned to the vm. for us the problem disappeared after updating the guest additions. also check the log file for the vm. i've seen some error from the virtual graphics card in the logs. also if you manage to blindly change the screen resolution it vrdp connect comes back to live.
bernd

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