I have a number of Windows XP SP3 machines on the domain that run GoToMyPC for remote access for contractors. Every once in a while, the contractors will call me up and tell me that they can't log in, all they see is a blue screen (not a BSOD). Checking the physical computer confirms this, it looks like the blue background behind the standard login "press ctrl+alt+delete..." screen w/ mouse cursor, but no "press ctrl+alt+delete..." dialog.
RDP to machine works just fine in these cases and rebooting the machine seems to solve it temporarily. The users have been rather unhelpful as to their last actions and the blue screen issue isn't consistently repeatable. Event log doesn't show anything unusual. It doesn't appear to be user specific either (other than being confined to the users that run GoToMyPC).
Has anyone else run into this issue/have any idea about how to troubleshoot it?