I have the same problem since today.
I get a blank page with a 500 error header, but there’s no error logged in my logfiles.
Some requests went through though, but in a truly random fashion, like first is okay, then 10 go bad, 5 okay, 8 go bad, etc.
That occured on 3.8 and 3.8.1 though (I just updated because I thought it might’ve been a problem with WP itself). Only thing that helped was disabling WP Super Cache so I guess there’s something wrong with the plugin.
Any ideas how to fix that?
