I came across this a while back but never got a chance to look into it futher.

Our AD profiles run a batchfile to lauch kixtart on login, which comprises of:-

 Code:
@ECHO OFF
%0\..\Kix32.exe %0\..\kixtartSig.kix


I've placed kixtart 462 into a sub folder and amended the batch file to

 Code:
@ECHO OFF
%0\..\KIX462\Kix32.exe %0\..\kixtartSig.kix


What i've noticed is that when logging in my home drive isn't mapping the U:

If I put it back to running 4.12 it's fine

Any ideas?