Cannot add new Builder/JDK inline when creating/editing a plan n IE7

I tried using the new inline creation of a builder and JDK in the create/edit plan wizard in IE7 and it didn't work correctly.

I tried editing a plan and clicking the 'Add new builder' link. Bamboo displayed a blank modal screen, then after a few seconds it displayed a login screen. When I logged in it did display the correct fields, but on the main window not in a modal screen.

Edit: I tried repeating this again and it seems to work, since I have logged in previously (via the modal window). The modal window is cropped though and cuts off half of the bottom buttons.