This is setup under Multisite, latest WP version (3.5.1). Network admin pages work fine. Already did the basics of testing; disabled/enabled plug-ins, turned off WP_CACHE and looked over apache error log (nothing showing).
When on any blog (2 installed), I make a change in the settings page and submit it, the URL before (and after) submit:
But the page that is shown is blank. I can easily go back a page and it shows the settings again, but they are not updated with the changes I submitted.
Would really like to change the settings, but it's not saving them and puts up a blank page. I have very minimal plug-ins installed (new install).