Received BI yesterday through pre-order. After making ALL 20 factions playable by updating the new descr_strat text file @ C:\Program Files\Activision\Rome - Total War\bi\data\world\maps\campaign\barbarian_invasion, discovered the following.

CTDs (Crash To Desktop)

From the Main Campaign screen, if you click on any of the following factions, you will receive a CTD:

* Eastern Roman Rebels
* Western Roman Rebels
* Slaves and Rebels
* Roxolani
* Burgundii

Blank/Empty Campaign/Strategy Map

You can start a new campaign with any of the following factions, but all you will receive is an empty/blank campaign/strategy map, and won't be able to do anything:

* Ostrogoths
* Romano-British
* Slavs

Skimmed through the manual and apparently these 3 are 'Splinter' factions. This means they may or may not appear during any campaign at any time, basically a random event. Might be different though if they are given starting provinces, armies, family members etc.

Other BI Factions

The other 'Unplayable' factions work fine after some tests, these are:

* Celts
* Berbers