I just installed the OnlineVideo plugin and noticed that the button was at the wrong position. Don't know if I accidently changed it on the install or if it is like this in the installer package (didn't want to reinstall). Maybe you can check your sources ?
I had to change to <posX>10</posX> and <posY>128</posY>.
I had to change to <posX>10</posX> and <posY>128</posY>.
Israel