In my Portal I have a subgrid with an Edit Basic Form inside. The form is long, and you have to scroll down inside of the popup to reach some of the fields.
If you click a lookup field in this Edit form, and are partially scrolled down the edit form, the lookup field opens (a popup in a popup), but you can't interact with it at all. You also can't scroll up the edit form while the lookup is open. The only way to interact with the page is to hit Esc. See attached.
If you are at the top of the form when you click a lookup field, it works fine - it's only when you're scrolled partway down.
This is only an issue on Safari. I was wondering if anyone had similar issues.