Unable to save email address for contact

I’ve upgraded to 7.7.6 and am now unable to save email address(es) for new and existing contact. I’m using the Suite 7 theme.

How do I fix this? Thanks.

We are facing the very same issue and if I remember it does the same thing for accounts.

but the weird thing is that if we retry an hour after it might go through.

for us it appear like an intermittent problem, with no log nothing to help diagnose…
If I remember correctly I do NOT think that it is them sensitive
using 7.7.6 IIS and mssql 2012

See Tseward’s solution here: