I posted my question here first:
Issue: I've an acceptance test (written in NUnit) which spawns an executable, which it then drives via the White 0.2 library. The executable creates a log file in the LocalAppData folder of the currently logged in user. The acceptance verifies if the log file contains the expected text. However when run via TeamCity, I get a FileNotFoundException with the path to the LocalSystem account's app data folder.
The tests all pass when run via NUnit in my local user's account (or when run via Resharper through the IDE)