German version: at Blur filter - blur tools - I cannot see the pins or circles or ellipses to use these tools properly. The functionality of the filters seems to work normally. I suppose this problem cannot be located with my computer or screen.
The problem is solved: it was only my fault. But it is very confusing: I checked - view - show - show extra options - edit pins. With this it did not work.
Only when the filter was opened, I could check - view - show - edit pins. Then it worked.
I feel, this is something like a mouse trap. But it doesn't matter any more:
Thank you for your intention to help me immediately!!