1.13 drop-down box regression
Just updated yesterday. I used to see this all the time, but haven't seen it for several minor versions. On Linux, sometimes drop-down boxes on a page will become unresponsive to the mouse. The only way to use them is to give them focus using the mouse, then scroll the active items in place using the down arrow. The drop-down menu never appears.
Recycling V. solves the problem.