Okay, this is really really strange. In my pm I had written a text with the following line in it


"with the mission_map and four photos from: a radar tower, armored vehicle, airstrip and artillery."

Remove the _ from mission_map and you'll get the error.
Apparently this word mission_map (again remove '_') isn't somehow allowed.
Oh, btw it happens not only when using the pm system it also occurs when writing a normal forum post.
Very strange .... :scratch: