Cinematic viewport doesnt work

Hello epic!
I am using sequencer for quite a while now and i was really hyped about the cinematic viewport. My problem is that whenever i hit shift+c, instead of turning on, the viewport only resets itself (cam jumps to original location, post process effects restart, game mode turns off, etc… etc…)
is this a bug or am i missing something?
best regards
Előd Somogyi

Preview 2 fixed this. Yaay!