Bug on Preview screen

Hello everybody,

Sorry for my bad english.

I'm a new user of DaVinci Resolve.
On my timeline, when I put video and sound, no problem, I can see in the preview the result.
But when I add text or effect, the preview is black.

What is the problem?

Thanks a lot.

Xavier

It is possible that your GPU is not powerful enough to run Resolve. Give us details of your computer including OS version, Resolve version, processor, RAM, and GPU, etc.