I booted it up today, nothing out of the ordinary. I usually boot it with the "sudo kdenlive" command. I hit render on a video, and left it up for several hours. And it stopped at 70. I killed it and tried it again. Stopped at 73. Rinsed and repeated, tried this process several times and the program cannot render a simple 5 minute video. Please help.

what versiOn?

Are you saying today you did not run it as root (which is what the sudo is doing)
Does it work as root?

I honestly don't know. I have the latest version off of the Ubuntu Software Center. And yeah it does RUN as root. if I don't run it sudo it has even more issues.

THe problem is the program is running but the render bar won't go up.
Like, it's not frozen.

You really shouldn't need to run as root / superuser. There was issues with a Frei0r plugin I think. Perhaps try sunabs PPA stable or git builds and see if it helps.