Problems with image upload and popup blockers

We have had isolated reports of issues where Norton Security, and McAfee security software causes the next button not to display on the first screen of the image upload process.  This is what is known as a "false positive" there is no real reason that this should be blocked, it seems however to match a pattern used by popups.  To resolve this issue you should choose to allow ads / popups (from your security software) for your own website (there are no invasive popups used at all, it is only necessary for this one small area of the system), this should resolve the problem, and will not impact on the normal ad blocking function of your security software.