Major Issue with Editor (Stable)

[AAROND93429 10]

Half way through producing a mission for Clan, and now getting very strange issues with the editor.

If i go to preview, it loads twice, then does a ARMA3 splash screen. When it finally gets into the game, the map, tasks, briefing area is black.

If i press escape, i have another menu under my current menu, and a box saying development build. I am not in Dev build, nor have i ever been.

Pictures to support..

http://iforce.co.nz/i/1ts1ktrb.v5l.jpg

http://iforce.co.nz/i/dqw32rs1.5he.jpg

http://iforce.co.nz/i/ynufan4y.vpe.jpg

The mission has not yet got a init.sqf, just a mission.sqm. I have also tried validating my game files, with no luck.

Anyone out there able to help?

Cheers.