When you changed the server, you must have left some no-longer-valid
shortcuts, links, mapped drive paths, even old PC3 files that need to have
been removed completely. Same with Windows, and old drivers for devices.
Basically, you need to get on each problem machine, and do a full clean-up
and remove all unnecessary and no longer valid items from AutoCAD's, and
Windows's, paths.
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Dean Saadallah
Add-on products for LT
http://www.pendean.com/lt
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