Video does not play with effects

When I add effects and texts the video stops to work properly.

What can be the problem?...I did not change the project settings....

Your hardware is probably not up to it. But if you don't tell us about it, we can give no further advice.

tks for answering.

my hardware settings:

i5 - 2,5GHz
intel HD graphics
Memory: 8GB DDR4

It seems that I have not memory enough. Is that the problem?

No, your GPU is the main problem. Please read the configuration guide at BM's site.