I‘d try with a new output format (create a duplicate) and see if that changes anything. Then I‘d try to reinstall and last but not least, see if OP 11is still supported to run on your current os at all.
But you can try to reinstall OP11 as suggested by @platypus. And I would try one more - (when you uninstall the app, rename/move the following folder: %LocalAppData%\Local\DxO_Labs\ ) then install the app.
I have and am communicating with the support.dxo.com team. waiting for their 2nd reply. @platypus, I have uninstalled it, and have removed the suggested folder above. In fact, i have removed both %programfiles% and %appdata% too. to no avail (as recommended below). Only thing left to try is to clean out the registry, which is the last resort.