Ok, this problem has been in the Mission Editor since v8. I wanted to make a new map in v8, but it said the exact same thing.
On a COMPLETELY UNRELATED topic: If you want more info on wrench events, find me on Blockland. I'm also named "gerry" ingame.
Mission Editor for Blockland has
NEVER been able to use New Mission. It's part of Torque's default stuff, and Blockland does not use it all. That means New Mission is not in BL, pretty much because around 97% of Blocklanders don't know how to start a map from complete scratch.
And for your first one...never heard of that happening.
Offtopic: Gerry, learn grammar, IF NOT PERIODS (.) -_-