I know this topic is old, but just to help out anyone who is doing a google search on this error;
-make sure you go into \my documents\my games\ <your men of war game>\
and delete the shader_cache folder, sometimes the pso files can get corrupted resulting in a render.gui render.scr crash to desktop.
-make sure your not missing or tampering human and human_for_cover skins, if you overwrite or delete these skins it will also give you a render.scr crash.
I've had this render.scr crash for an entire week, and deleting the shader_cache folder from my documents did the trick. Now its back to having fun!! >
and this is off-topic:
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www.moddb.com/groups/gem-2-editor-fan-club