Joe's suggestion worked for me. (Great guess Joe!!!!) When I clicked on "Manage my network passowrds" there were already two entries there from two other users that had used this workstation. I first 'disconnected' the mapped drives through 'My Computer'. Then came back to the 'user account' settings and deleted both entries LEAVING this blank. Re-booted, then re-mapped drives through 'My Computer' checking 'reconnect at logon' and everything has been fine since!!
Enviroment
Workstations XP Pro
Server Win 2003 Standard
----- Joe wrote: -----
This is just a guess... Try going to user accounts on the control panel.
Select your account. When the " What do you want to change about your
account?" window opens, select "manage my network passwords" under Related
Tasks. in the blue pane to the left. Enter your user name and password for
the computer with the drive you are connecting to.
RE: disconnected network drives 
Linear Mode
