Not sure what this could be but I’m curious if the same thing happens if you map the overwire/insert functions to different keys? Is the problem an issue with the overwrite/insert actions or the F9/F10 keys is what I’m trying to figure out. Again, I don’t know how to fix this but narrowing down what the problem may be is always a good thing to do. It could be a simple thing like the keys need to be remapped and then might be able to be mapped back.
Have you tried clearing your preferences? Could be a problem within there. I use Digital Rebellion’s Preference Manager as it has good support for all NLE’s. Free download;
https://www.digitalrebellion.com/prefman/download.html
This is also a good tool that may help you diagnose and solve the problem. Free trial;
https://www.digitalrebellion.com/promaintenance/
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