Having odd bug in my mfc single doc program (VS2008). When calling AFXPrintPreview(this), an assertion gets tripped. Looks like on line 181 of afxpreviewviewex.cpp, when mfc tries to get a hold of the docking manager, it just gets NULL, which trips an assert when mfc attempts to add a pane on line 183. Specifically, I get the print statement: ASSERT_VALID fails with NULL pointer. The parent frame being passed into GetDockingManager() is definitely my main frame. I would assume this means that there's some initialization my frame must be missing?
afxGlobalUtils.GetDockingManager(pParentFrame); returns NULL
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