Webbrowser-Control and Plugins

[Firedragonweb]

Hi, i've got a problem regarding the System.windows.forms.webbrowser-control as it won't host certain plugins that run fine in the standard iexplorer. The problem occurs roughly on 50% of the machines, interestingly mainly those with windows vista on it. (Although there are vista-PCs where it runs just fine). Any help would be appreciated, Michael.