Autodesk Inventor

[#1]

Hi all;

This is a really odd one. I changed the font (App, Options) from Tahoma to Segoe, worked with it like that for a while, didn't like it and changed it back to Tahoma. Then got the below (IV Pro 2012, latest SP, unfortuantely I cannot read the About dialogue)... 

Any idea how to fix this? Every time I start Inventor it's a different font (non of which I can read).

I have IV 2013 Pro installed on the same machine, no problems there. Could that be the problem?

[#2]

This looks like Arabic to me.  Is it possible someone is messing with you, since you say it keeps changing?

[#3]

By someone I assume you mean Autodesk?

I'm a single user, no network, all updates (Microsoft and Autodesk) plus Avira Antivir Premium up to date and running. 

No, it must be a software issue. I also had IV 2013 beta installed at a stage, I'm sure something must have gotten corrupt with all the installing and uninstalling and hotfixes.

Anyway, I'm using 2013 now (as of today). No problems so far.