I am currently investigating a fix for two DVB Radio issues identified a workaround for those affected.  If you are getting a "No TV Signal" blue overlay when tuning to a DVB Radio station, particularly a low-bitrate station like BBC World Service, or you are seeing 15+ second channel change times for changing between DVB Radio and DVB Video channels, this workaround may apply to you.

This involves editing your registry, so if you are not comfortable doing that, please wait for the binary fix to be released.

The key is:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Media Center\Service\Video\Tuners\DVR

Set NearUnderflowCheckMillis=4000 (0x00000fa0).

If you are not experiencing problems with DVB Radio, do not change this value.  If you are in the U.S., for example, it can cause instability with ATSC tuning.  Once the binary fix is released, you should return this value to its original value of 2000 (decimal).

This is a non-supported, non-official workaround and is provided AS-IS, with no warranty.