Don't know if this is your problem, but here's
ours: Occasionally, our login batch script that maps network drives by
user fails - thus no G:, H:, R:, (whatever), etc. The user doesn't
know this and starts up AutoCAD. Since the drive paths listed in
the AutoCAD path are gone, the menus don't load - thus no
toolbars. The only way to get them back is to do what you mentioned -
delete the profile and re-import and set current. We haven't found a work around
or a fix...