Successfully running 2.1 on our VPS but Mautic is not functioning 100% (to the point of not being usable) since upgrading to 2.5.1
1) When clicking "New" under Contacts the wheels are spinning (I see the bar moving) but nothing actually happens. After about 10 seconds the bar stops spinning.
Same when clicking:
- "New Email" under Channels
- 'New' under Segment
2) Quick Add under Contacts brings up the form, but when pressing save it blanks out the button and does nothing.
I haven't test everything but these 4 issues I have found so far. (I had trouble using the Upgrade button, so have had to reinstall from scratch.
3) I have found this new eorr in the logs
2017-02-03 15:07:17] mautic.ERROR: Deprecation: Accessing type "submit" by its string name is deprecated since version 2.8 and will be removed in 3.0. Use the fully-qualified type class name "Symfony\Component\Form\Extension\Core\Type\SubmitType" instead. - in file /home/xxxx/vendor/symfony/form/FormRegistry.php - at line 100  
Could anyone shed some light on this please?