boa constructor / virtualbox

Hello,
      I am running boa constructor on an XP virtual machine (virtualbox)
with Ubuntu as the host OS. My development files are in a shared folder
(P:/ as far as XP is concerned). I can open/edit/run files on the P
drive without a problem in e.g. IDLE. If I attempt to open said files
in Boa it hangs and I have to force virtualbox to quit. I can open
other files (on the C drive) without issue. I'm not sure where best to
ask for help with this, but I thought someone here might have hit this
problem before and found a solution. Any help appreciated. Thanks.

Duncan