Gimp 2.10 can't draw a line in Gimp 2.10

[Draglor]

Good day

I have used Gimp a few times to resize and edit images.
I installed Gimp 2.10 yesterday.
Using a brush, I left click in the corner and drag my mouse to the other corner and no line appears.
When I release my mouse the line suddenly pops up.
When I used 2.8 it worked fine.

Is this some setting I am missing?
I would appreciate any help.
Thanks