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Usually when Cimatron will not start, and error message will be given.  Licensing, Graphics, etc.

However there is one type of start-up problem caused by screen position of windows that gives no error at all.  Cimatron simply tried to start and then stops.  In such a case delete 2 files from the C:\program data\3D systems\Cimatron\14.0\Data folder

CimXplor.pos
ModalLayout.pos.

The system remakes these files on start-up, so there is no need to replace them.