[SOLVED] Cannot create Activity after updated version 5.0.1

I don't think returning to V5.0.0 could change anything.
Getting back to V4.5 could possibly help, but I'm afraid you will have issues with attachments.

Please give more hints to help you solve this issue on V5.0 :
- which browser / version do you use ?
- could you please check browser console ? Hit [F12] should open console (be sure to be on console tab). Report any issue logged in brower console.
- could you try with another browser (for instance you could try portable chrome) ?

I use exactly same Chrome version without any issue.

1) Check for zoom : please try (if not already set) with zoom = 100% (avoid zoom <90% and >150%)

2) Try and disable every browser extension
(I faced stange behaviors with Skype Click to Call)

3) Try and open in new tab (with current tab logged in) :
http://localhost/projeqtorV5.0/view/objectDetail.php?objectClass=Activity&objectId=
and post result here.

http://localhost/projeqtorV5.0/view/objectDetail.php?objectClass=Activity&objectId=

Response is not complete.
Attached is expected response...

Please do it again, then on response right click in window and select "show source code" (or equivalent).
Post here result of source code.
Thanks.