Time cursor can't get before 0

Hi there, I have a problem with time cursor. For some reason now I can’t move my cursor behind frame 0. I switched from my old computer to new one and I would bet that it was possible before. I tried to search some solution, but wasn’t able to find anything. It is possible to move time cursor behind zero or it is something I thought would be possible but never was? Thanks for your help.

File / User Preferences / Editing, enable ‘Allow Negative Frames’ for playback


thank you very much!