I had the same problem in a multisite whereby after installing a new site, I activated some plugins and everything went blank white screen.
OOH! All my sites, 6 of them were gone.
I tried all recommendations here on the forum but none worked.
What I did on the second day was to replace the main site theme FUNCTIONS.PHP with the original I had in the download folder. Luckily it worked.
I did the same for all other sites and it all worked.
So DON’T PANIC, JUST REPLACE THE FUNCTIONS.PHP FILE IN THE THEMES WITH ORIGINAL CORRESPONDING THEME FILE.
THAT’S ALL YOU ARE DONE.
Come back and thank me.
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This reply was modified 9 years, 3 months ago by mukundi.
This really helped me out. I had two days of hustle.
Thank you Sterndata
