Is it on startup?  If it is, and you happened to recently do a Windows Update that included Internet Explorer 11, that's the culprit.  There is an update to fix this issue... 

http://poser.smithmicro.com/poser9-updates.html

When you install the update, tell the installer to "Keep Your Existing Preferences"

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The Wisdom of bagginsbill:

"Oh - the manual says that? I have never read the manual - this must be why."
“I could buy better software, but then I'd have to be an artist and what's the point of that?"
"The [R'osity Forum Search] 'Default' label should actually say 'Don't Find What I'm Looking For'".
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