I have transferred a form to Nintex Forms 188.8.131.52 now i get an empty form (on opening) - when i remove all datepicker fields - it Displays perfect!
Is there already a solution for that?
It sounds you the form you are using has the legacy people picker control present in it. On December 9th 2013 (version 184.108.40.206 of Nintex Forms 2010 and version 220.127.116.11 of Nintex Forms 2013) we changed things up a bit with a new people picker control. To keep using the previous version you can do the following:
For more details on this change you can view the release notes here: Nintex Forms 2010 - Release Notes
I hope this helps!
FYI: I had very similar behaviour and it ended up to be that the version upgrade didn't restart the Nintex Forms feature at Web Application level (CA - Application Mgmt - select web app - click Feature in Ribbon, disable if enable and re-enable),
furthermore I had to to go to the Site Collection Feature and stop the Nintex Forms pre-re and Forms features and re-start them and it was all fixed.
Hope this may help someone.