The bubbles for color elements on the Professional tab move around and eventually disappear after multiple instances. This can be demonstrated with the Property Grid example on the Telerik Demo Application. Go to the First Look example and open the color editor for any of the color properties multiple times.  The more times the dialog is opened the worse it gets.

Hi Robert,

I was able to reproduce this issue. I have logged this issue on our Feedback Portal. You can track its progress, subscribe to status changes and add your comment to it here. I have also updated your Telerik Points.

Unfortunately, due to the nature of the issue, I cannot provide you with a workaround for it. We will do our best to fix this in the upcoming release. 

Should you have any other questions do not hesitate to ask.

Regards,
Dimitar
Progress Telerik