I got a download from the search, and apparently I had downloaded the same file before through a nzb. So it went into failed files. Only the .par got downloaded afaik. If I go into failed files and click on delete that listing and then select yes for partial deletion, it seems to hang forever on some loop and the whole application doesnt respond. Always happen every single time. The .par file did get deleted though, so it looks like it has finished. This only happens for me for this particular situation, other failed ones are fine to delete. I'm thinking it's either trying to find and delete something that it isn't there or that it could be finished deleting and couldn't delete the item from failed list?
Edit: Looks like if I close the app and reopen it, it removes it fine. Only happens if in the same instance it went from downloading to failed list.