Hi, all,
In a nutshell:
I downloaded new Site Builder, and then one by one disabled old SB modules before activating new SB.
Quickly realised that I was going to need to go back to old SB (I think I need to export the old setup to bring into the new one). I activated the maintenance mode, disabled new SB, and began re activating old SB modules.
I think I had done the first one, and on saving changes to the second one, I was faced with the header, the menu, and a blank white screen. The 'admin' link by the ACP menu had disappeared, so I manually logged out to try logging in again - and I can't - it's just the header, the menu and a blank white screen...
Help!
EDIT: My laptop is still logged in as Admin, but the white screen issue is persistent. I cannot access the ACP - or any page....
updated by @iamtimbo: 12/22/16 11:55:59AM