I have the same problem, in my case - because that’s my default setting in Windows XP - it is the language de_DE. I get the the warning two times in a row after opening a project.
Have either of you updated to the latest builds? In the Bug Hunt forum, you’ll find announcements from the developer with instructions on updating the beta (it’s up to 3 now), as well as semi-daily updates on the state of the software—known bugs—what is being worked on, etc.
The bug you mentioned was fixed quite some time ago, unless you are running beta 3, then this is potentially a new problem.