A quick excel table showing browser compatibility:
i-PV can be run with all major browsers. Firefox and Chrome renders all elements without problems with the exception of draggable elements not firing properly in Firefox. There is a "relocate" button instead to substitude drag behaivour in firefox and mobile. Several issues regarding Safari is due to my reluctance to use vendor prefixes (which I find very unnecessary).
Do not forget to check for possible errors in the console!. While reporting any issues, a screenshot of these errors and a brief discription of your last action would be a great deal of help. Thanks in advance!