black screen when using opengl on gzdoom

Any suggestions on how to fix it?

Even on windowed mode I got a black screen.

What's your graphics hardware? And which version of GZDoom did you use?

I think he probably has an Intel GPU.

They are known for having shitty OpenGL support.

I had an low quality Intel GMA GPU 5 years ago that suffered from a lot of texture issues and heavy graphical glitches.

@Sergio,update GZDoom or your GPU drivers ,otherwise buy a dedicated GPU.

Not available because of your PC hardware, i know it because i have use true-color setting for an old Intel i have.
 

I just downloaded the new GZDoom 3.5.0 and I am having the black screen as well when running openGl. Here are my specs.

Operating System: Windows 10

CPU: Intel(R) Core(TM) i5-6402P @ 2.80Ghz

GPU: Intel(R) HD Graphics 510 or NVIDIA GeForce GTX 960

RAM: 4 GB

I can only run GZDoom in software mode, and it runs fine. 

Can you try GZDoom 4.2.4?