Ok, here the story. When entering battle, the loading bar will stop halfway and the cursor arrow comes out but no error reported.

a) if I press escape to get to desktop my pc usually hang so I can't see the error.

b) if I press space bar the game continue the load and I can successfully enter battle.

I have never met any kind of this error after 2 years of modding RTW/BI ...

Any ideas why it's happening or any ideas what files usually associated with this kind of error ?

p/s: don't ask me what files have I changed because it's actually a beta build for RTR VII so it's basically hundreds of files changed.