Thanks for all your kind responses. I am just going to have to accept that the "new" system does not work for all. No issues at all with image uploads elsewhere using Internet Explorer, just this site. I still feel that having a space character in my Mayhem screen name, not allowable in Mayhem images, is very significant. Not seen anyone else with space characters getting this to work.
I believe it is very significant that the new Mayhem image button is red (inactive?).
OK. I always resize my images before uploading, so maybe the new site does not offer any real advantage over SmugMug. Using that I can imbed the BB code anywhere in my text, to illustrate a series of points. The direct upload to Mayhem or the new image site always stuffs them at the end and they are not visible in preview like they are when I use SmugMu BB codes in my text.
Transferring photos from my camera to mobile, where I have no means of cropping and resizing them, is not practical and would be a very long winded process.
So, until someone can figure out why Martin's new hosting gallery is not usable for all I will stick to Paint Shop Pro and SmuMug. They are both very quick and easy to use.