Hi! You've got it. It's exactly the problem. The VADC Flash video problem appears only in Internet Explorer browser, not Firefox or Chrome. When the "Vmware Flash Optimizer" plugin is disabled in IE, the problem disapear and all works perfectly. So, we discover that when we pass through VCS server, the pool Flash parameters is apply correctly: these settings are disabled in our pool so there is no "Flash optimization". But when we use VADC, it seems that the Flash optimization" is enabled and it's why the video is better when the mouse cursor is put over.
Now we know were this difference come from and is not really a bug. The only thing View could be better, it should apply the pool parameters, ie Flash Optimization, whenever we use VCS connection or VADC.
Thanks!