I've noticed an issue with the Brickset website on my iMac, whick relates to entering the ACM details.
I'm using Safari v5.1.7, and when you go to edit the ACM details for a set (edit page), the save icon (on the right), is not displayed.
It appears that the columns either dont fit in the space, or the Hoz scroll bar not display. This basicaly means you can't see the any columns after Notes (e.g the save button!).
It would be good if this could be fixed.