I run Win XP Home Ed, on which I have set up two users. One user is always logged on, the other is used sporadically (usually with the main user still logged on).

BOINC is placed as an "Autostart" application, and exists for both users (due to my inability to deactivate it from the secondary user's Autostart, it seems to be a common Autostart for both users, as it disappears from both whenever I try to remove it - sometimes I hate Windows...). Whenever I log on to the secondary user it seems that a new instance of BOINC starts (is this correct - my problem description rests on this assumption??), and I try to disable it immediately.

Two weeks ago I had at last received a nice supply of approximately 15 WU:s to crunch. I happened to log on to the secondary user just seconds before one WU was finished, and BOINC was about to switch to the next WU. I did not have time to disable the new instance of BOINC. What I got was a number of error messages (details now forgotten, they may have mentioned "file slots" or something similar) which I interpreted to the effect that BOINC failed to move WU:s in the internal queue system. As a result all but a few WU:s were lost to the system.

My conjecture is that two instances of BOINC competed in trying to update the internal queue system.

[Update Aug 6:th] So, after switching my brain to the "on" position I managed to solve the Autostart thing, at least. Boinc was, by installation default(??), placed in the Autostart section for "All Users" ("Document and Settings/All Users/Start Menu/Autostart"). Moving it from there to the appropriate user's autostart solved that part of the problem. Still remains, though hopefully not relevant to me anymore, the possible problem of competing instances of Boinc messing up the internal queue structure.