>>No chance. The backups run from 11pm to 4am without exception. I can delete the files without problems on other workstations. Only these two Acer TravelMates have problems.
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>How about the clocks on the bad Acers, could they be off a lttile?

The clocks on the two Acers, as will all the pcs, are synced with one of the servers at login. I just compared my clock to another pc (that doesn't have this locking problem) and the clocks match to the second.