Plugin: Viper's Video Quicktags

Hi

I have the following problem: In most of my post in my blog i the plugin give this message: [ERROR: Unable to parse URL, check for correct YouTube format]

To the last version everything was OK. This problem is with my old and my new posts. It is very strange…
You can see the problems here, for example:
http://ivomirchev.com/2011/10/citroen-xantia-%D0%B1%D0%B5%D0%B7%D1%81%D0%BC%D1%8A%D1%80%D1%82%D0%BD%D0%B0%D1%82%D0%B0/

How to resolve this problem?

Thanks!