@pirl8: Thank you for clarifying that, I knew I read something similar in the last weeks.
So beware if you update, you might loose the usability of some fonts due to the sizing restrictions. If ixtab doesn't find a way to circumnavigate the problem (its always the simple tasks you mention casualy on the side...

), I might have to downgrade my KT in the future. Usability of fonts (not only custom ones) has the second highest priority for me after hyphenations.
Btw, might it be a valid option to look into "resizing" default vector forms of fonts? I really dont want to, but...