MATLAB : set Path does not work anymore

For some reason MATLAB 6.5 now ignores all paths that I set either via menu Set Path or addpath command.
Has anyone had this problem ? I am running matlab 6.1 on the same machine (dont ask why, its a long story ..) and the MATLAB environment variable was deleted. However, adding an environment variable containing the path to matlab.exe doenst help either.

A grade for any answer that will help.

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Computer101Connect With a Mentor Commented:
PAQed, with points refunded (125)

E-E Admin
LeifBAuthor Commented:
Found the answer. Anyone interested, the command to fix this is

rehash toolboxcache

dont ask me why or how
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