Try doing a Save As and renamed your video. Then render your output. This will keep your new render files from "bumping into" your old render files.
If that doesn't work, please provide more information about your system.
What operating system are you using? How fast is processor and how much RAM do you have? How much free, clean, defragmented space is on your hard drive?
What model of camcorder is your video coming from and what format and resolution is it? Did you use Premiere Elements to get the video from your camcorder to your computer?
What Publish & Share option are you using to output your video?
I'm having the same problem with my Premiere Elements 9, where even if I try to cut and edit my clips on my sceneline/timeline it crashes, even when I render my footage to AVI so I can edit with the clips later on.
I'm using Windows 7
-My Proccessing power is 3.50 GHz
-My RAM memory is 8.00 GBs
I seem to have all the qualifications to use my editing software, but apparently it's crashing still, and I've cleared up any program from the background as I work, and I even re-installed my software, I played around with the compatibility thing, but it still crashes.
I'm using an HD DV camcorder
I would also look over this FAQ Entry: http://forums.adobe.com/thread/792580?tstart=0
It starts with a checklist on setting up PrE to run its best, and then goes into tuning up one's computer and OS. Finally, it offers many links on troubleshooting, and links to some useful tools. I recommend doing this last part pretty much in order, as it works up in "degree of difficulty," all the way to the MS tutorials on The Case of the Unexplained.
Sometimes, Assets can end up on the Timeline, with say a gap between them, or other issue, and starting a New Project will often clear up the glitch.
One of the troubleshooting steps, that gets recommended often, is to test with a New Project.
Glad that things are working for you, and thanks for reporting.