There was never IE 10 in 8.1; it came with 11; some are apparently confusing your problems with an issue with IE11 for Windows 7.  Since Poser 10 SR2 or higher is stated to work with 8.1, this is likely something else.

With Poser running browse in the Poser Program directory to Runtime/ui/FlexLSMGUI/Flex/bin-release/ and open LSMGUI.html in a web browser with a working flash plugin installed; does the Poser Library appear?

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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?"
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