At design time when placing a TWebRadioButton on a web form, there is only an empty frame visible. At runtime the control is painted correctly on the browser page.
We are not aware of any issues with the design time painting of the TWebRadioButton. Are there any other TMS WEB Core controls that are not displayed correctly at design time? Can you please make sure all TMS WEB Core packages have been installed correctly?
If the problem persists, please provide which version of Delphi you are using so I can further investigate this.