Hi Ilona,
Are there a particular set of steps that make the problem occur? This would be something like 'always for this customer', or 'when I click that button after entering that text' or questions like that.
If there is no discernable pattern to when the problem occurs, it could be related to available free memory on your workstation when attempting to perform a process, or the anti-virus checker hogging resources. Or a number of possibilities (access violation errors are quite generic in nature and don't usually point to a specific cause).
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Regards,
Softrak Tech Support