Today we ran into a problem in our recently upgraded APEX environment. In one of the pages we had a report defined on a pipelined table function. This function also changed a package global variable. The value of that global variable is used as a source for a page item that shows up in the same region just below the report. This ran fine in 4.1, it runs fine when we set the "Compatibility Mode" to 4.1 as well. But if we set that mode to 4.2...the page item shows...nothing !!! What happened? According to the help on that Compatibility Mode property, items (and regions) in a display point are evaluated before rendering that display point. This is done to find out whether items / regions are displayed or not - to support the grid layout. To dig a little deeper (thanks to Patrick Wolf, who was helping us with this issue): As soon as the region grid is calculated, the same is done for the page item grid in the region which gets painted next. This calculation also has to determ...