[racket-dev] No browser window coming up for HelpDesk on menu

We're having intermittent problems in which the HelpDesk doesn't come up
from the DrRacket menu in our classroom installation.  We're running 5.1.3
on Windows 7 64-bit enterprise edition.
The default web browser is Internet Explorer 8.

We haven't detected a pattern.  Sometimes, simply nothing happens when we
invoke HelpDesk from the menu.  Other times, it works fine.

Our sysadmin reports the following details about our setup:

The only thing weird that could be causing the issue from our end, is that
we push out the deployment with Microsoft App-V (formerly softgrid) however
I've turned on the flag to allow local interaction with the application
which by all means allows it to open and run things outside of the
application itself.

Any ideas, or requests for other info about the system configuration that
would help here?

thanks,
Kathi
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