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Sorry, @machiel.veldkamp I didn't see your earlier reply.

 

My best advice (without any provided Inventor files to test your rule on) is to comment out the Try Catch blocks you have as one of them could be hiding an underlying error in the rule. If it runs without them, then slowly add them one by one testing as you go.

 

It's tedious I know; did you say the rule was previously functioning correctly? If so, perhaps a roll-back of the latest-installed hotfix for Inventor might help.