For anybody following this: I've made a little progress (I think) with this problem. First of all there are 3 things:
1. TAXINAUT is to big to fit the screen. This happens when windows scaling is set to more than 100% (right-click desktop -> Display settings).
2. When people talk to you and the text is animated, a word that was being typed out on one line suddenly appears on the next line. This is as intended (well it's as it's currently programmed but could of course be better but it's not a bug).
3. Text is actually cut-off or only partly visible (I have not been able to confirm this). This would be a bug that is probably also caused by windows scaling.
The current best work-around is still to set your windows-scaling setting to 100% But I'm looking into doing some automatic scaling to compensate. In that case users will still have to set taxinaut.exe's compatibility options, that is, High DPI settings to let TAXINAUT handle the DPI scaling because else it causes issues with text-rendering.