Joe found a problem with Modern Tribe’s Events Manager PRO plugin today. He wanted to change something on a recurring event, but when he tried to save the change, he had a window popup asking if he wanted to change just the one event, or all of them. The problem was that the button wasn’t clickable. The whole screen was greyed out. Having seen this before, he poked around in the code for the page and changed the z-index to the ridiculously high: z-index:1000000; in order to gain access to the button.
The bug has been duly reported.