I have much fun with MLVapp and thus thanks to all devs and others for it!
Since Masc introduced the export-preset in the export settings menu, I sometimes have tried it again (at least when new version came out) but it never worked for me. I'm on Yosemite, Catalina and High Sierra - everywhere the same. I can make one preset, but it disappers on next program start.
(this seems to not be the case with v1.10, it remembers then the presets, but all are the same setting, usually the one I did first, i.e. prores 4444. If I activate another one, like tiff, it has the same prores 444 setting applied)
I really tried some possible ways to get it. What I am doing wrong? Does some of you guys use it on mac without problems? let me know please.