This is possibly a regression as a result of the fix for Issue #1446

Build is v4.0.2.4-g127baf4dc-0 Windows 64 bit QT

Overview screen shows this:

Moving to the poll UI shows there are three active polls currently:

Relevant segment of getmininginfo:

"MiningInfo 1": "",
"MiningInfo 2": "Poll: this_is_a_poll",
"MiningInfo 5": "",
"MiningInfo 6": "",
"MiningInfo 7": "",
"MiningInfo 8": ""

@cyrossignol Also reports seeing this issue.

NOTE THIS ISSUE IS ALSO PRESENT IN RC2