Everytime when you activate a toggle skill character stops runing, example: transfer pain, vicious stance and other like those.
it's not a bug just not implemented from Gracia
http://legacy.lineage2.com/news/graciafinal_05.html
It has been changed so that the actions of a PC do not stop when a toggle skill is used.
1st time i see this sry, played many RU servers wasnt like this.
if it would be in extender I'd have turned it on