Anybody see this before? I opened up Terminal.app and the window is completely blank. There is nothing in it whatsoever. Looks as if bash never started. The title bar simply says "Terminal — login — 80x24". I can type whatever I want in the Terminal window like it's a text document and nothing happens. If I restart the computer, this seems to fix the problem, but it seems to only be a temporary fix as the issue happens again soon after.
Looks like maybe your .profile or .bash_rc (or .bash_profile) file might have some bad syntax in it. Either you edited one of those files, or something you installed edited one of those files. If you use a program like TextWrangler (free) it has an option to open hidden file and you can see if any of these files exist. They'll be in your home directory. If any of those files exist paste the contents here and we can try to figure out what might be wrong with them.