more information is needed - what OS ( looks like vista maybe? ) I believe there are some issues with vista ( and also windows 8 ) try deleting your preferences folder and restarting poser ( if you do not know where your preferences folder is here is a script).

If that does not work, remove poser using Geek uninstaller and reinstall it.

if that does not work, try floating your pose window instead of docking it.

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