Missing Advanced Grid on Tab
I have a mashup with two tabs and similar data on each tab. Each Tab has two advanced grids. Whichever tab is loaded initially displays correctly. If I switch from the initial tab to the other tab the lower grid is not displayed just a solid gray line. If I refresh the page that tab will load with both grids, if I switch back then that lower grid will be missing. I had a similar issue on a mashup that was visually migrated but went away when I created the mashup from scratch. Each Tab has a fieldset to allow for relative positioning. See picture below.

