Been having a bit of trouble with the Easy (yeah right) Customizer previews and ive finally figured out that its not my fault but yours (a ha). If i go to it from the Homepage Tools>Easy Customizer it works fine updating the preview etc., BUT if i go Homepage Tool>Account Settings>Easy Customizer it shows the original default homepage. Im glad i figured this out as i dont have to call my doctor now

It would also be very helpful if on the All pages themes in the control panel that it would actually do that rather than having to go through every single gallery.

Are you seeing a different preview when you access the Easy Customizer from the two different places? I checked on your site, but the preview looked the same to me. Or, are you looking at the preview after making a specific change there? If you could give us more details about how you are seeing this problem, let us know, and we'll try to recreate it on our end.

Regarding the All Pages theme, it will apply to any gallery on your site, unless you've applied another theme on a particular page. If you want to reset the theme for all galleries on your site at once to the default theme (which should pick up the All pages theme), you can do that by going to any gallery, clicking Tools > Gallery Settings > Multiple Galleries, selecting All galleries, and changing the Theme to the default one here.

Ok Ive been trying out a few changes in the preview. First of all when i go to the Easy Customizer through the Account Settings it doesnt show what is on the live site at all!! ie new header etc. Whereas going to it Tools>Easy Customizer it shows the live site. Also as ive said i tried making some basic changes when i go to the Easy Customizer through the Account Settings and nothing happens except for the Basic Appearance tab of changing Dark to Light, whereas getting to it the other way things change as they should.

Ah, I see what you mean. I've made sure to report the different previews showing for the two Easy Customizer previews. For the time being, I suggest that you use the Tools button > Easy customizer as that seems to give a more accurate preview. Sorry for the hassle.