I have an iPhone 5, and have a real problem with the VGCollect interface on the device. In "popover" modal windows with forms (i.e. add item to collection, add gallery image) the builtin safari browser can't seem to understand the dimensions of the modal, and will only let it scroll to the very bottom of the window. This puts the submit button in the bottom area that brings up the toolbar if you try to tap it. Trying to scroll or zoom tries to affect the page behind the modal rather than the modal itself. Very frustrating if I just entered information on a new purchase, and I can see the submit button but can't hit it.
Fixing it might be as simple as adding more bottom padding to .modal-footer on mobile devices.
I wonder if I am doing something wrong since I couldn't find any other complaints about this issue in the forums.