program monitor turns black.

[kimi76530301]

I'm using a Premier Pro.
Video1 is Video Video2 is color matte
If you work on a color matte,
The program monitor turns black.
The sound comes out loud.
When you restart the Premier Pro, the program monitor is properly displayed.
If you work on a color matte or decrease the length of the color matte, the program monitor will be black again.
Why would he do that?

My computer specifications are

i5-6400 2.70ghz

16gb ram

gtx750i

plz Help..

[Jim_Simon]

Try Steps 3a and b.

Unofficial Premiere Pro Troubleshooting Guide