In May 2018 we had several members contact us to report that they have been unable to upload images to our galleries; the upload would hang, sometimes reporting a timeout error, sometimes with no error message.  It appears that an update to the Safari web browser - the default for Apple systems - is the cause of this behaviour; this seems to be an on-going problem, and has been reported by other websites.  Our continuing advice to Safari users who experience this problem is to change to an alternative web browser; we recommend either Chrome or Firefox.