hi there, I thought I'd see what this -nogui flag was about and now Pd doesn't run anymore, I have mac os 10.7, intel

I re-downloaded, replaced it, but somehow this flag seems to remain there somewhere and it won't open again. I tried this with Pd and Pd-Extended, and even downloaded different versions of them. Once I put that flag in there, there seems to be no way back.

Or is there? Where can I edit this back?

And what was it supposed to do anyway?

thanks