Just wanted to add that every application that wants to find by itself suitable sreenmodes (like Earth 2140 intro, ShowAmiga96 and so on) now works PERFECTLY!
It is a shame that these two updated libraries, emulation.library and Picasso96API.library, can't be downloaded from ANYWHERE, hosted permanently somewhere, as of today (especially since they were freely downloadable on the Prometheus support page before). They did indeed solve many problems I've had with apps in the past!
Once again, thanks for the help!