I just updated to 4.6 from 4.5 and all of my XML files now have the following warning: No grammer constraints (DTD or XML schema) detected for the document. I've been searching desperately to find out why this is happening but i'm getting nothing. I read on a stack overflow forum that you're supposed to go in to preference > XML > XML Files > Validation and change some DTD settings there, but in this version, it's not available. I tried ignoring grammar versions too. Still nothing. Anyone run into this issue before? Looking forward to your feedback.
Actually, i was able to figure this one out just now. If someone happens to run across this issue, this is what I did to solve it:
Preferences > General > Network Connections > Cache then click on "Remove All" and go back to your xml files, right click and validate. That should do it for you! Hope this helps someone.