There are only a couple of things of which I can think here, the first being you have multiple copies of the app, and the one you created the report in is not the one you are now opening.
The other would be if you opened things via File\Open in Server option and created things there, in which case that is going to now be a Server Report, not a Document Report, so you would have to open the file via QlikView Server again to see it.
You would have to have done this via Internet Explorer Plugin Client or Desktop Client, Ajax Client cannot create Reports. Hopefully this may let you find things.
Regards, Brett
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