I'm using Smart Photo Grid 2 (the mushroom one).

Select the grid > Web Properties > Image - and set the Po-Up Width to anything (I used 1000). It works perfectly.

Go back to the Pop-Up Width (note it's reverted to the default off and 500 even though it works) and change to another value. The grid refuses to pop-up at all.

I've tried ctrl clicking individually (which then shows the Pop-Up Width, but doesn't work. I've tried swapping the photos. I've tried pasting attributes from a working grid and I've tried cursing. Is it a bug, or am I missing something?