Hello, I have downloaded and installed SS 6.4, but I'm having issues with the Late Era Campaign. SS 6.4 launched both campaigns without problems, and 6.4 handles the Early Campaign well, but when I'm at the faction selection screen and select either the Teutonic Order or Lithuania the game has an CTD. The same happens when I pick a different faction and try to start the campaign. Here is the system log:

Spoiler Alert, click show to read: 
20:22:11.950 [system.rpt] [always] CPU: SSE2
20:22:11.950 [system.rpt] [always] ==== system log start, build date: Feb 25 2008 version development ===
20:22:12.012 [system.io] [always] mounted pack packs/data_0.pack
20:22:12.059 [system.io] [always] mounted pack packs/data_1.pack
20:22:12.090 [system.io] [always] mounted pack packs/data_2.pack
20:22:12.121 [system.io] [always] mounted pack packs/data_3.pack
20:22:12.137 [system.io] [always] mounted pack packs/data_4.pack
20:22:12.153 [system.io] [always] mounted pack packs/localized.pack
20:29:58.076 [script.err] [error] Script Error in mods/SS6.3/data/world/maps/base/descr_regions.txt, at line 816, column 1
Couldn't find region name 'Corinth_Province' in stringtable
20:30:00.253 [system.rpt] [error] Medieval 2: Total War encountered an unspecified error and will now exit.


I have tried reinstalling it, but no change. I have Windows 7 and Kingdoms is patched to 1.5. I have Steam on my computer, but I don't have M2TW on it. I installed it according to the instructions, including the fix for the UAC issues by giving full rights to the M2TW folder every step of the installation. Am I just missing some files, or did I do something wrong in the installation?