While scrolling on a worksflow sequence, if you pass by a comment activity like the one in the attached screenshow, the scroll will stop and the mouse wheel won’t work again unless you “manually” place the pointer outside the comment and start scrolling again. It’s annoying, it makes you lose track of what you are doing and also leads to thing like something happened, or that the hard disk is swapping, until you realize what’s going on.
The buggy behaviour maybe could have some sense if the comment was a text box with a scroll on the inside, but that’s not the case - the activity box gets as big as the comment is to accommodate the text’s length.