The new 4.0 ui tells me my filter is too complicated to show in simple mode (although I created it in JIRA 3.13. correction: Even searches that I created just a few seconds ago don't properly roundtrip).

I can't edit the filter in advanced mode either, since somehow it doesn't detect my "3.1" and instead suggests everything that starts with a "3", but has a limit on the amount of items shown. See screenshot.