Comment 12 for bug 518533

I have the same problem. using ubuntu 10.04 had same issue with 9.10.
Locally logged in I can mount drives , but when using remote connections using NX I cannot mount drives.

I have a pc with Debian Lenny and that has no issues at all mounting drives.
Although it doesn't

Based on what I have been able to google it looks like it is probably related to the policy kit stuff

there may be some script which is ran when the system is run locally but isn't run in NX sessions.