Stay away from DomPlayer, check out Remoc's (post #4) link about in this thread
http://www.gnutellaforums.com/genera...ec-issues.html

I've never used Media Player Classic, I don't like WMP. If you're having problems with making other players your default player, you might have to change file associations within WMP (so that it stops trying to be the default).
In WMP11 click on Library > more options > file types. Now untick all the formats that you don't want WMP to play > apply > ok.

I think that having too many codec packs can cause problems, AFAIK you're better off just sticking to one pack.

If you're still having problems, maybe you could try VLC player? It's free & has codecs installed to play most file types...if VLC won't play it then chances are the file's bad. The thread below has a link for download.
http://www.gnutellaforums.com/tips-t...p3-fixers.html

It's up to you whether you renew your Pro or not. Your privileges will expire & then you won't be entitled to email support or free updates any more. If your Pro hasn't expired yet, you still have while to decide (the renew nags usually start a few weeks before your Pro actually expires)
Are you using a Beta version now? You can go on using whatever version you have now for as long as you like. You should only renew your Pro if you think you'll want to update in the future! Providing you have your Pro installers saved, you can always reinstall an versions that you've downloaded while your Pro was current.

If your Pro hasn't actually expired yet, you can still download the latest Pro version for free if you want to update. The changelog hasn't been updated yet, so I can't tell you what's different in the latest version.