Actually, I have a ton of issues with TC in IE. And TC in Firefox doesn't even replay for me. But let's start small, and figure out this error to start.
This happens sporadically in interactive mode, Usually, I just have to close the FF editor and reopen. Sometimes I have to restart Vugen.
If I run the script non-interactively from Vugen, I get a different sporadic error, "IPC connection to browser process is lost".
Maybe these are related errors, maybe not. In any case, I am hurting, and I can't show ROI of a broken product. Even if I have been using LR for 10 years and TC for 2.