I had the same problem and found this thread. I have 2 application windows open and used Change Screen on the PO dialog and it disappeared. I couldn't get it back using typical methods, as described in earlier posts. Rather than copying the .xml file from another computer, I closed MS and renamed the existing .xml file (making it useless). Then I started MS again and started PO and it appeared normally. A new .xml file was created automatically. I'm running SS3.
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