I am sorry to hear you are running into this problem. However there should be no problem with a x64 bit system.
Please elaborate a bit more your scenario. Is that 32 bit system another box? If so it has a different
video card, different drivers that could affect the problem.
In order to help you best and reproduce the problem please if it is possible send us the project and provide a direct access to the application or create a sample project to demonstrate the issue.
Thank you for your cooperation.
the Telerik team