Hi Elliott,
I just upgraded to 3.1.1 and am still encountering the problem. I have been able further trouble shoot the issue and it appears that any Gravity field utilized that involved “validation” i.e Password, and Email (with validation activated) caused the error message to appear.
Warning: Illegal string offset ‘4.2’ in /home/XXXXX/public_html/wp-content/plugins/gravityformszapier/zapier.php on line 554
This is my production environment and is causing my quite a headache with user management.
Any guidance on how to resolve this would be greatly appreciated.
Patrick