I have installed modx on an external server, and all was fine, but when I logged in today - something very strange happens.
If I try and edit a resource, chunk, TV - ANYTHING - I get a flash of the element on the screen, but then it goes white - leaving just the butons top right (Save, Delete, Duplicate, Close, Help!).
If I click ANY of those buttons, the resource/chunk/TV etc is restored, and I can carry on editing - any ideas what could be causing this strange behaviour?
Running the latest version of MODX (2.8.3)
PHP version: 7.4