To replicate, simply goto any torrent that has lots of multiple files, Right Click, > Priority > Custom
Click the box to enable, now, clicking any of the tabs such as size or priority, well is just for show and definitely a waste of time as they do nothing. Broke, and can not understand how this was over looked??? Be nice to quickly sort and put a download order based on size, alphabetical or numerical order... Fixing this will probably do this, as well as give those clickety tabs a purpose for living... ;) Cheers, and hope this post help towards the next best or the best client out there...