Windows XP SP2 + all current patches

Client 32 4.91 SP3 + all current (non beta) patches

While logged in to a tree, and trying to authenticate to the tree using the right mouse button,authenticate on a server and enter another loginname, you get the warning you are allready logged in to tree yyyy as user xxx are you sure you want to login as user zzzz ?

When you click yes the client32 and as a result the whole workstation hangs. Have verified this on multiple PC's in our organization.

Has anyone else these seen this, or can anyone else reproduce this ?

Kind regards,