Ok, I just deactivated all plugs again, this time I cleared the server cache, and I restarted them one at a time. When I turned on Facebook Thumb Fixer the txt appeared. So you are correct, it was Facebook Thumb Fixer. I will contact the makers of that and see if I can find a fix. I really like that plug in so I will figure it out.
strange, I disabled every single plug-in but buddypress and the txt is still there. Perhaps my install of buddypress has been corrupted in some way? If I delete the plugin and re-download and install it will I loose all the profile data?