Hi,
I've been having the same or very similar issue.
A screenshot wouldn't be of much use I fear - visually all that happens is that the settings appear to get reset to their defaults after being saved. To clarify though:
- Click save
- Page overlaid w/ loading spinner
- "Settings saved" confirmation
- Brief pause
- Page appears to re-load
- Default settings appear in input fields
Trying to send the test email confirms that there are no settings saved.
Note that in my case it works fine on some of the network sites (including the "original" website in the network), but not on others. I haven't been able to discern a pattern - all use the same theme and plugins and have few or no differences asides the CSS and copy.
Does that help narrow it down at all?
Thanks,
Nick