If so, I seem to have missed the news (and can't find it in the docs or the forum).
I stumbled upon this here and it could be the explanation for why FindDupesInSubfolders does not work anymore.
When FDIS is run on just a few folders, they'll get quickly enumerated, the command lines get generated and started and then the script finishes, abandoning almost all Find dialogs which will keep spinning endlessly.
Prefixing Find with @sync seems to kill the Find dialogs without getting results back.
I'm pretty sure FIND has always been asynchronous. I asked about this a few months back when it was clear that its behaviour did not match what the docs said.
The abandoned dialogs were caused by using Find RUNINPANEL in the script. Without this parameter, Find is back to its normal behavior (whatever that may be ).