Mapped drives not showing in first run of Windows Explorer

You might try enabling "Always wait for the network at computer startup and logon" via a group policy or manually with gpedit.msc. The setting is in Computer Configuration\Administrative Templates\System\Logon.

More info can be found here and here.

Are your users local admin of their workstations? If so, they may have installed a shell extension that is interfering with Explorer.

Try installing this:

http://www.nirsoft.net/utils/shexview.html

and disabling anything that looks unnecessary.

(Disclaimer: Never used this tool myself, but have seen various Windowsy people recommend it).

You could also try getting the user to log on to a known good workstation and see whether the issue occurs there.

It's a bit of a long shot, but could it be that the mapped drives are empty? One of explorer's folder options is to 'Hide empty drives in the Computer folder' - this is set 'on' by default.

Hi I hope this is the solution to your problem:

http://support.microsoft.com/kb/297694

It may not be, but there isn't enough information in your post to be sure. Please try the workaround section, and if it does work best to call microsoft for a hot fix.