After closing the Itch app this morning, I woke up to a sluggish PC. A quick inspection revealed the above. 

I immediately closed it without thinking to check which process of the app was still running. I recently noticed that the hard drive upon which Itch lives was suddenly missing 100+ gb space. I could not find the files that were created, and I am very concerned about this sudden and quite aberrant behaviour.

it's very odd that it was still writing to disk at the time. 

It had crashed a few times when clicking a creator's twitter link, but I didn't notice any lingering processes. 

update: it's only been about 60-70GB, but it's still an astronomical amount

Okay, another update. it looks like because the app was trying to use more than 100% of the available RAM, and the system was being used at the same time, it caused the automatic paging file allocation in Windows to go absolutely nuts and allocate uh... 82GB of disk for it. To me this implies that itch was trying to glom up nearly 100GB of RAM at some point? (the 22 GB free that it ate up, plus this 82?) 

Whether that's a correct assumption, this shouldn't have happened.