Acrobat Reader 9.1 ActiveX control problems

We have an application written in VB.NET 2005 which displays a PDF file using embedded ActiveX control from Acrobat Reader (using AcroPDF.dll).
The code to open the file is very simple:
Me.AxAcroPDF1.LoadFile(_path)
The application was compiled on the machine that had Acrobat Reader 8 installed and distributed. The users also had Acrobat 8 installed.
Some of the users upgraded to Acrobat 9.1. I understand that it shouldn't really matter as the ActiveX control from 9.1 should be backward compatible.
Yet some users cannot open the file and receive the following error message:
"Error HRESULT E_FAIL has been returned from a call to a COM component"
Some other users can open the file but have the following message when closing the application (which calls Me.AxAcroPDF1.Dispose() ):
"The instruction at "0x0700609c" referenced memory at "0x00000014". The memory could not be "read"."
What can cause those problems? How can I fix them?

OK, no one responsed to my questions but I found answers for them so I thought I might put them here for those interested.
As for "HRESULT E_FAIL" message, all that was wrong was the "Display PDF in browser" option in Adobe Reader preferences. It needs to be ticked. A bit weird but considering that it uses the same OCX in a web browser, it makes some sense.
As for the memory issues message, I need to unload libraries manually before exiting the application (as suggested in some other thread in this forum):
<DllImport("ole32.dll")> _
Friend Shared Sub CoFreeUnusedLibraries()
End Sub
Me .AxAcroPDF1.Dispose()UnmanagedCode.CoFreeUnusedLibraries()

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Update to 8.0.2, please.
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message
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