A user has pointed out a recurring issue he has in sketcher... namely the constraint symbols disappearing.
It's not the constraint display icon being turned off and a screen repaint doesn't bring them back either.
It doesn't happen all of the time and it's not just the same sketches each time.
Only way we know to resolve is to restart Creo.
He is running Creo 2.0 m100 (issue occurred with earlier build codes as well) on a 64-bit Dell Precision T3600 with 16GB of Ram and a Nvidia Quadro K4000 graphics card, driver version 320.
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