We created a number of popups in Landing Pages, and there are a number of bugs (or we can't find the solution, since it isn't documented):

- Actual size/dimensions of popup doesn't appear to be visible or changeable. Stuck with the presets;

- Very easy to corrupt the editing of popups without an undo facility that works;

- When adding elements, if you exceed the size of the popup, you get a scroll bar created. But it stays there forever - even if you reduce the size of the elements. Cannot get rid of it;

- We created numerous text boxes. When going back into editing mode for popup, those text boxes were not editable, and had shrunk so that the text was not able to be clicked on. Had to keep deleting and recreating them, just to edit the text.

VERY buggy!