When i first open up a project I have been working on, I skip to the last frame and this pop up appears and also when i first opened it i never had a bar at top that says file,edit,help etc. Please somebody help happens to like every animation i do.
try to close stykz at all, reopen your project and if this doesnt work: try to minimize the frame window on one frame (normally you can see a preview of some frames,but make the window as small as possible) and then make some frames, that worked for me once also try to delete the last couple of frames, before you do that ( i had a blue preview in the frame window as this happened)
otherwise i wouldnt know how to get rid of it :/ sorry (and yes ive seen your comment on my video xD)
then as i said,i dont have an idea how to fix it...sorry :/ even though stykzman wasnt very active the last time,you could at least try to ask him if he could take a look at your file (just upload it anywhere,explain the problem in a PM and send him the link)
you could split your animation in parts, so you dont lose everything if stykz makes an error just animate 30 frames in one file,the next 30 frames in a new file etc. i made the same with my longer animations :D