So it returnes to the menu screen when you try to play RTW vanilla campaign?
I don't know if Roma Surrectum overwrites any of the vanilla files but i would guess its one of the files for the imperial campaign thats been changed when you installed Roma Surrectum. Sounds like you'll have to uninstall RTW and reinstall it. If you do this you could make a folder called games and have say one folder called RTW Mod Switchers (uses a modded folder). And another called RTW Vanilla which could be used for say my mod which overwrites the vanilla files. All you would have to do is after installing RTW again is copy the game folder Rome Total War over to the newly created directory and install the mods you played.
The better way would be make a folder on the desktop called games or something like that, now create a new folder instide it called Mod Switcher or something and then copy your current Rome Total War folder from the game directory into this one and then uninstall Rome Total War. This way you get to keep your current mods and get your vanilla files back from the fresh install.
I never overwrite the stock files, i have a filder on my desktop called modified games and inside that is all the games i play that have been modded, i have also a backup of the RTW vanilla data folder in their as well. Just in case i make a mistake one day and forget which file is which when editing it. I use the show side by side feature so i can say view one units stats whilest changing them on another unit rather than going back and forth all the time or minimising one text window to view another.
Here is the pictures i said i wanted to upload of a night battle.
And a couple of pictures from my old campaign.
And finally some pictures of new units for RTW Vanilla Mod Beta V6.0 which i will work on when ever i get free time. All unit cards have been fixed since taking these pictures.
Hope this helps.
Roy.