Video Clean Feed - both monitors greyed-out

I have two monitors connected. I can use them both outside of Resolve. They are both greyed-out in the Video-clean feed drop-down menu.
https://forum.blackmagicdesign.com/
https://forum.blackmagicdesign.com/viewtopic.php?f=21&t=150599
Dwaine Maggart wrote:That would happen if you have Dual Screen On, and Resolve is already using both displays.
Phil Side wrote:Dwaine Maggart wrote:That would happen if you have Dual Screen On, and Resolve is already using both displays.
Thanks. Turning Dual Screen off fixed it.
Charles Bennett wrote:If you are using the free version it does not provide clean feed, only the Studio version.
Otherwise turn off Dual Screen and you can then select the display you want to show the Clean Feed on in the Workspace menu.
Charles Bennett wrote:I would suggest you export a copy of your database first, though I've never had a problem when uninstalling the previous version before a new install.
Just uninstall the free version of Resolve in Control Panel/Programs and Features and install the Studio version.
Charles Bennett wrote:The reason I advocate uninstalling an older version before installing a new one is based on experience with Windows. In the past having installed a newer version of Pro Tools over an old resulted in Windows interpreting the full installer as just an update and then only installing parts that it saw as changed. Chaos followed. So since then I have always uninstalled the earlier version first.
Charles Bennett wrote:Personally I've never had a problem with the downloads page but there we go.
Charles Bennett wrote:All I would say is that having adopted the regime of always uninstalling older versions of Windows programs before the install of a new version has given me stable computer systems that don't suffer the problems that others seem to experience. That's with both PT and Resolve.
Charles Bennett wrote:Personally I've never had a problem with the downloads page but there we go.
Charles Bennett wrote:17.4.1 on the 29th October and 17.4.2., which has just had a build update to build 9, on the 17th November.
Charles Bennett wrote:It no longer exists having been almost immediately replaced by build 9.
https://forum.blackmagicdesign.com/viewtopic.php?f=21&t=151119
Charles Bennett wrote:There would be no purpose in keeping build 8 with its VST problem..
Charles Bennett wrote:True, as has happened before, there was a silent update, and BMD should have announced it.
Charles Bennett wrote: I don't have update notifications turned on in Resolve. I look at the top of the forum and read the release notes when there are new versions.
Charles Bennett wrote:As to labelling, the free version has always been called just DaVinci Resolve, with the Studio versions having Studio in their name.