All transitions are giving me a black screen

Hi everyone,
I used to used Davinci Resolve 14 and I never that this problem.
In between I formatted my laptop and downloaded the new Davinci resolve 15 but it seems like there's wrong with the transitions.
First the quick transitions that you set using these little white tabs in the timeline don't do the attended effect. Instead of a fade in & out effect I just get a black screen. As soon as I pass the time I set the transition the video come back
Then I tried to add a proper transition from the effect library and exactly same behaviour when it reads the moment where I added the transition the screen goes black.
My system is clean as I just formatted it and installed a clean windows 10 and my davinci installation is also clean as I just installed it and didn't mess around with the settings or anything so to me it sounds like this is a bug with the new version.
Has anyone been experiencing the same issue? Any idea how to fix this?
Thank you
I used to used Davinci Resolve 14 and I never that this problem.
In between I formatted my laptop and downloaded the new Davinci resolve 15 but it seems like there's wrong with the transitions.
First the quick transitions that you set using these little white tabs in the timeline don't do the attended effect. Instead of a fade in & out effect I just get a black screen. As soon as I pass the time I set the transition the video come back
Then I tried to add a proper transition from the effect library and exactly same behaviour when it reads the moment where I added the transition the screen goes black.
My system is clean as I just formatted it and installed a clean windows 10 and my davinci installation is also clean as I just installed it and didn't mess around with the settings or anything so to me it sounds like this is a bug with the new version.
Has anyone been experiencing the same issue? Any idea how to fix this?
Thank you