I've been enjoying the hell out of HitFilm Express 2017 (5) since late April. I just upgraded to HFE 11 and about half of the ~8 HFP files I have (all for one project) aren't usable now because HitFilm pegs all 4 processor cores at near total capacity and gradually consumes every KB of memory on my entire Win 7 operating system after opening them. Exiting HitFilm also doesn't work -- it never terminates the process, which continues to accumulate memory unless I manually end the process in Task Manager. I let it go for over ten minutes, hoping it would eventually shut itself down, but no luck.
My suspicion is that there's a source MP4 file imported into these particular projects that's missing a character or something in it's format that would normally tell the software where the file or a variable ends, and that the latest version of HFE, not receiving that character, simply spins on forever, gradually allocating more and more memory for that one variable or file indefinitely. It's just a theory obviously, I just have been a software engineer since 1995 and that's the best working theory I could produce from the symptoms.
If I can't get these files to work with HFE 11, I'll have to downgrade back to 5, although unfortunately I can't find my installer for 5... So if someone could help me figure out how to download the older version again, that would be great as well, though obviously I'd like to have these files working in the new version. It seems like this is a support ticket issue? But I wasn't sure if that applied to HFE or if it's limited to Pro licenses?