I actually believed that Utorrent 3.5.5 build 45952 finally fixed the problem of randomly dissociating files - which causes all sorts of problems.
I got my database of torrents 100% fixed, which took nearly a week to accomplish. 7800 torrents running just fine. But then.. for no reason.. without a crash.. about 900 of them lost their associations again. I give up!
Qbittorrent seems to be the most promising replacement for Utorrent/Bittorrent. They just updated to version 4.3.4.1 and there is a 64 bit version.
Rafi and a couple of others have been doing a fantastic job of making Utorrent work as best it can, and helping people overcome problems. The fact that Rafi's repeated pleas for a 64 bit version have been ignored - tells me that Utorrent is never going to solve it's problems.
I am keeping utorrent on my computer, but I won't be using it to download new torrents. I will use it to seed old torrents, and probably phase it out completely in about a year. Microsoft Windows operating system and Facebook are also loaded with errors that will probably never be fixed.
It's interesting that in TV shows and in movies, computers are always shown working flawlessly, with no delays - yet in reality.. we get shit. Microsoft makes untold billion$ off of it's crappy software, even though you don't buy it directly, every computer product you purchase is forced to pay royalties to Microsoft. Even if your computer doesn't run Windows, computer manufacturers STILL have to pay Microsoft for every motherboard they produce. It's great to have a monopoly! Likewise with Facebook. All facebook cares about is collecting and verifying your name, mobile phone number, location, email addresses and any other information that is none of their business, so that they can sell it to advertisers, marketers, investigators, government agencies, and anybody else that will pay for it. Facebook even does their best to prevent you from using your own database of friends and followers to do anything. Their lists are not alphabetical, not consistent, and unusable.
If Qbittorrent has big problems, I will let you know.
So far, I am very impressed with Qbittorrent. It is very smooth and fast, and doesn't lock up or crash. The one tiny problem I found is that if you have a torrent that contains multiple files, but you choose to skip some of them.. everything is fine UNLESS you then add those files later. To fix it, you must remove the torrent (making sure you don't remove the files as well) and then add the torrent back and re-check it. This is a very minor problem that I am sure they will fix. Most people never skip files within a torrent - and when they do, they don't add them back - so they would never notice this error.