Having created a new custom list (even with only a text field) I am unable add new items to the list - the error message is Unexpected response from server. The status code of response is '0'. The status text of response is ''. when in 'quick edit'.
If I try to add or modify an item in the list by clicking 'add new item' I get "The server was unable to save the form at this time. Please try again."
I have restarted the Sharepoint Search Host Controller server but to no avail. I have 24Gb RAM for this server so it's not a memory issue (8Gb available). I have also tried from various browsers including Chrome and Safari - still the same error message.
This error only occurs on lists. I can edit document properties in a library and have no problems with calendar entries.
There are no entries in the event viewer, so where do I need to begin looking to find out what is (or rather is not) happening?