I can't see the cover of my PDF books. Appears only the Adobe logo. How do I resolve this?

could give me hand?

it problem may simple, experts you,

but i'm taking drubbing, nikko ...

is following:

have adobe reader 10.1.0, because i'd rather, simplicity,

and ok ...

but few days here, don't know happened,

but can't see @ all

the covers of books in pdf, on miniatures.

the thing appears adobe icon instead of covers of books.

could give me hint solve problem?

i immensely grateful.

already uninstalled , installed again, no avail.

thank , await response.

best regards,

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