sometimes, if it's a two layer board, you cant just simply jumper it to fix it. You have to know whether if there are two set of traces connected to that particular point. I suspect a short or something weird happened when you tried fixing the board.
As for the opamp swap or cap swap, I'm sure they arent the cause of the problem.
EDIT: Have you tried swapping back the old opamp to be 100% sure that those arent the cause of the problem?
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No. Nothing to see here.
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