I see. I'm afraid but, this should very well be a problem resolved with 2.6 or 2.7 already - in this case you can try a full clean re-install (if that is possible even) to see if it helps, otherwise maybe you have the chance to tell your department that an upgrade would be very vital? In general because I'm sure you want to use the new features as well.
Yes, I am dying for the 2.7 update with orthographic projection!
But alas, I will likely have to wait, I will bump this thread if, once updated, the problem persists.
Until then I will assume its resolved in the latest version.