I tried this a few times on mac and win using a recent Beta build (Pr24.3xBeta012) and could not make the space bar act like the Add Marker shortcut (M). @Latevalkama Is it possible you just hit M instead of Space by mistake since the keys are right next to each other on a standard latin keyboard layout? More importantly, if you see the problem again, can you let us know right away using this forum post?