Whenever I edit anything in Portal, whether it be an Feature Service, Map Service or Item....I get:
Unexpected token <'
Any thoughts on what could causing this? I am using a federated portal with arc server. Everything besides editing the feature properties (Name/Extents/Summary/Description) are working.
Have you tried using Internet Explorer? I believe this is a known bug. I have been having this problem as well. See the blog link below.