EDIT: I gave up on this and did a reinstall.
I log in, the desktop doesn't change from the LMDE login screen default background to my background. My dock doesn't load. The desktop icons don't load. The mouse cursor moves around the screen fine. I can't seem to run any application, but I can hit CTRL+ALT+DEL to bring up the system monitor.
Something is not starting correctly. Any suggestions on how to troubleshoot this?