I am seeing the same behaviour here on Windows 2012R2.
I 'had' been using DBConnect without issue on another server running Windows 2008R2.
Trolling for an answer.
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Hit F12, look at the icons on the Left Hand side of the console at the bottom of your screen. Scroll down and hover over the icon until one says Emulation. You should then see on the right side a Mode Opetion at the very top , select 9 and your browser will allow you to login and work with Splunk.
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This works {{AND $rising_column$ > ?}} with MSSQL
The ? references the rising_column field you set outside the query in "Tail Input settings".
After the first parse where the entire output of the query is pulled into Splunk.
The tail option kicks in and only pulls in new data based on the rising column.
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