My records show that I have uploaded 12,056 photos and 114 videos from my iMac to various sites and servers since 2009. This is the first time that there has ever been a problem. I have just made a test upload to another site from both the iPhone and the iMac without any issue. I made a photo upload to the Hornby Forum in a post on the 18th March and there was no problem. So it may be premature to attribute the problem to Apple, especially when there are current bugs with the Hornby website e.g. when trying to find the 18th March post referred to above, I looked at the MyCommunity/ForumActivity webpage. It fails when you press the 'Next Page' or page selection dropdown box, by taking you back to previously viewed screen rather the next page of Forum posts.