Don't know when it happens but after a while I see this in my logging:
2011-03-08 14:45:40,861 Trac[formatter] ERROR: Macro Poll(Which of these do you prefer?; #1; #2; #3; query:component=Request-a-Hack&status!=closed; Cheese dip) failed:
Traceback (most recent call last):
File "build\bdist.win32\egg\trac\wiki\formatter.py", line 717, in _macro_formatter
return macro.process(args, in_paragraph=True)
File "build\bdist.win32\egg\trac\wiki\formatter.py", line 304, in process
text = self.processor(text)
File "build\bdist.win32\egg\trac\wiki\formatter.py", line 291, in _macro_processor
text)
File "build\bdist.win32\egg\tracpoll\tracpoll.py", line 129, in expand_macro
return self.render_poll(req, title, content)
File "build\bdist.win32\egg\tracpoll\tracpoll.py", line 162, in render_poll
priority = Priority(self.env, ticket['priority']).value
File "build\bdist.win32\egg\trac\ticket\model.py", line 664, in __init__
type=self.type, name=name))
ResourceNotFound: priority none does not exist.
It's Trac 0.12.1 running here.