Trouble importing old project files to newest version

Having trouble with LMMS? Ask about it here.
Hi there! I gave the forum a quick look-through and didn't see anything that sounded like the problem I'm suddenly having.

I recently (read: last night) installed Ubuntu on my laptop to replace Windows 7, which has been giving me problems ever since I've started using it. In Windows 7 I was using LMMS 0.4.X (don't remember the exact version number but it was one I downloaded in 2011 sometime). This morning I got the newest version of LMMS from the Ubuntu software center, and then I took my project files folder (the lmms folder that had been living under My Documents in Windows 7) which I'd backed up onto an external hard drive prior to installing Ubuntu and replaced the current lmms project files folder (home/<username>/lmms) with it. I opened one of my old project files in LMMS and played it through, and it worked fine.

After that, I opened another one and when I played it through the output was heavily distorted and sped up and basically just unintelligible. Every file I've opened since then has done the same thing, including the one which initially worked just fine, and also including the demo files.

If anyone can offer any insight as to what I should do, please let me know.

Thanks,
-Ivan
Hi Ivan!
spugintrntl wrote:This morning I got the newest version of LMMS from the Ubuntu software center...
This is your problem. The Package in the Ubuntu repository is broken.

See the instructions to add the KXStudio repository and reinstall LMMS from there.
http://kxstudio.sourceforge.net/Repositories
Ah... well that would explain a few things. I'm glad it's something simple, though. Thank you!
Hmm, thought it was updated? That has been a problem, yes, but I thought it was updated? Why isn't it updated god darnit