filters problem, it doesn't show right away some times.

Hello, I posted as follows before, but I didn't get any relpy. Could anybody help?

Hello, I was checking filter effect in 2020. 0. 2 version. I first tried blur filter with graphic symbol, editing filters on a frame. But the effect didn't show. Tricky thing was that after doing some stuff, I could see the effect after all. So I tried blur filter, using move clip symbol. I expected this is more stable. But this didn't show up either, and then showed up after a while. I wanted to find at least some pattern, so I tried with a new project. And this time blur effect showed right away. I have to keep trying filters and will see what the problem is. Is there anyone who experienced this?