Steps to reproduce the issue:
1) Open any PDF
2) Choose the hand tool (or select tool) from the toolbar user interface
3) Close the PDF (progam does not need to close)
4) Open the PDF again
5) Note which tool is now chosen (it is not the one you changed to)

Environment: Windows 7

Expected result: The setting to be remembered after closing the program or PDF and opening the program or PDF again next time.

Observed result: Changing from select to hand or hand to select setting in the toolbar UI (Toolbar Item:->Select and Zoom Tools)

Working Function: There is a way to make Adobe Acrobat remember, 1) Open a PDF
2) Right-click in the open window
3) Make you choice (select or hand tool)
4) Close PDF
5) Open PDF again
6) Your setting will be the same as you chose before closing - SUCCESS :D

But this bug should be fixed so it is working with both methods.