There are a number of threads of things to watch out for if one treats a lot of files in one go:
Are the files OK?
See here for tools to check them:
Also, it may be worthwhile to treat only those files that really need treatment. So use a filter like %title% MATCHES "(?-i)The "
Which other programs may block the access?
Are the access rights OK for all files?
Does the freeze happen always with the same file(s)?
A unresponsive program seems to be a theme that frequently pops up in your posts, e.g.
So it looks suspiciously like something local and you have not got down to the root cause.
I would assume that nothing in the topic of this current thread is true: your problem has neither to do anything with the quick actions nor with version 3.21.
That's a good one. Ohrenkino is extremely knowledgable and is a tireless contributor here. He pointed out some misconceptions on your part, coupled with your failure to respond to important questions that he posed. Those failures make it difficult for him (or anyone else) to help you. Can Ohrenkino sometimes get a little testy with problematic posters? Sure, but they usually deserve it.