Of course the preset scaling should stay after reboot - it's not different from a user zoomed state that should survive reboot. And for most users it does. This might be an issue with your 2 monitor setup where both have different resolutions/scalings.
EDIT: Oh, we posted at the same time! Thanks for the additional info. So this is a dual monitor full screen issue, it seems. We try to check this out.
EDIT 2: Sorry, but I don't understand those screenshots. Correct scaling (135).png shows TMFX in full screen mode (upper right button for full size had been pressed), so fully occupying one monitor, right? What exactly changed in wrong scaling.png? Vertically all three rows are still fully visible, the content of the side bar did not change (means same zoom state as before), and the upper right symbol shows fullscreen mode active again - yet there is less horizontal space in the three rows. So is that TM FX window no longer fully occupying the whole monitor, shrinked in horizontal size?
It looks like TM FX is no longer full screen but has reduced its window size significantly, only horizontally - with zoom/scaling not changed. Please clarify.
Regards
Matthias Carstens
RME