within a spreadsheet the datapilot is used to create a table. within the table grouping of date doesn't work properly, no grouping for month possible.
Known problem, see sc/qa/extras/scdatapilottableobj.cxx#testCreateDateGrouping
see bug 43609
If this is a "known problem" (according to comment #1), the Status should be NEW, right?!
I can't reproduce this any more using the latest master and 3.6 builds. Closing.