Lost the sound for the last 10 minutes? That's very different.
Try clearing the video from your project (right-click and select Clear -- it won't be deleted from your hard drive).
Then re-import the video to your project. This time make sure to let it completely conform before you start editing. (You can see the progress in the lower right of the interface.)
I somehow screwed up clearing and reimportin the video, but I started all over again with a new project and made sure it finished the indexing stuff and this time worked. Thanks for the help.
I had some other problems though, but I won't do anything about them
* The video was broken (black and silent) when I exported about 28 minutes to a 5 GB file .mp4 file. Happened to me twice, with a computer restart and new graphics drivers in between. Thinking there might be a 4 GB limit I removed some scenes and successfully exported a 3.9 GB file.
* Premiere Elements had some minor graphical bugs and a crash but nothing that caused any loss of work.
Any 4gig limit is imposed by the hard drive format... FAT32 has such a limit, NTFS has no limit
If you are on Windows, you may convert a FAT32 drive to NTFS by searching at http://search.microsoft.com/search.aspx?mkt=en-US&setlang=en-US
convert FAT32 NTFS
and read the article(s)