Resolution Bug after Beta 3 patch

[AgentGB]

Upon loading the game up, resolution will be fine, Once alt tabbing out, then back in, the Resolution of the menu expand hugely, only allowing some of the buttons to be viewable on the left hand side. This has only happened after downloading Beta patch 3. Seems only fixable by shutting the game down, and reloading.

[Valerius Maximus]

from the patch 3 patch notes:

Here are the patch notes for Total War: ROME II- Patch 3 (in BETA as of 20/09/2013):
Disclaimer: There are one or two known issues with the beta that we are looking to resolve before rolling this out further, with ALT-Tabbing and changing game resolution. We are aware of these issues and there is no need to report them in our patch feedback threads.
Technical and Performance Issues

so looks like that is a known issue with the last beta patch