Video importing broken

none of the videos I tried importing today were successful (russian).

here’s an example:


Same for me.


EDIT: yesterday and the day before I didn’t have any problem at all.

Same for me, another thing, I cannot expand video window, for some reason clicking on expand button just recentres this window to the initial spot

Yet when I click youtube interface video behaves normally, goes fullscreen or shows subs.
Forgot to mention that this problem only exists in sychronized text “mode”.