Acroread Problem

[Clint <clint@xxxxxxxxxxxxxxxxxxxx>]

I'm having a problem with Acroread. I installed it following the 
instructions found at artoo, and it has worked without any problems 
until recently. I'm suspecting some update I've run is interfering with 
it now. When I browse with Mozilla 1.6 to a pdf file online, Acroread 
stops with the pop-up error message:

"There was an error opening this document. No such file or directory."

A blank Acroread application window is open in the bottom right-hand 
corner of the browser.

I have checked that there is indeed a pdf file at the location, by using 
wget. Then I can easily open it using either xpdf or Acroread locally. 
So the problem seems to be with Mozilla and Acroread.

Is anyone experiencing similar symptoms?

If this is unresolvable, how I can I tell Mozilla to use xpdf as the 
default pdf viewer?

Thanks,
Clint

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Clint <clint@xxxxxxxxxxxxxxxxxxxx>