We are aware of this issue in the RAdHTMLPlaceholder from Q2 2011 SP. The good news is that this is resolved in the internal build from 4th October. You can download the hotfix from your account page at www.telerik.com. Please accept our apologies for the inconvenience caused.
the Telerik team
Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>