AECOSIM SS6 crashing

I have just created a new AECOSIM SS6 build for a client and 2 of the users are getting the following message:

Immediately after this the program crashes.

What's odd is that everyone else in the office is working OK.

I have removed all user files to allow the program to create new ones.

The problem follows the users around as they change computers, yet other people can log on to the same computer and everything works.

I thought it might be a Windows User profile problem.

Has anyone seen this before and can someone point me in the direction of the solution.

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