Can't Change Theme - Edit Theme - Anything With Theme

Hey all

For some reason I can't change themes

I can't use the visual editor

I can't delete a theme

Every single time I try anything in the themes section I get

404

Page Not Found
The page you have requested cannot be found.

I'm at wits end trying to fix :(

This issue requires examination on your server. Please contact us via Help Desk, so we can examine the issue in more detail.

This issue requires examination on your server. Please contact us via Help Desk, so we can examine the issue in more detail.

Same issue here as well, even though your Help Desk did do a great job this weekend in fixing our checkout problem with our V4.2.4 store, now it is the visual editor, can't save any changes we have made with the within the editor. No it cannot be the server because this store is on the exact same VPS

Well some mysterious ... fairy / wizard has helped us but I do not know who to thank.