minitube freezes

Hoooowdy fellow trisquelians!!
I use minitube to view youtube vids without the need of flash or even a browser.
A fairly secure way to enjoy YT..

Now I have this issue - If I set 360p as max quality videos are reproduced flowlessly smooth. no problems at all.
Setting 1080p or 720p and clicking on any video results in minitube freezing completely (the video works for like 5 seconds and then freezes), i have to xkill it. Found no workaround..

Some of my friends use ubuntu. They experience the same issue with very different laptops..
Has anyone of you have a possible solution for this??
Any suggestions are quite wellcome!