sudden transparency

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Just very recently, I've found that my application is, while running, and 
when an update is made to my data, suddenly changing to a partially 
transparent surface. I've never seen this before (though I haven't changed 
the visad library recently).  I've never wanted or played with 
transparency, so I'm not sure where to look. Has anyone run across 
anything like this? Where might this be coming from? I do use a custom 

Thanks for any help

Donna L. Gresh, Ph.D.
Optimization and Mathematical Software Group
IBM T.J. Watson Research Center
(914) 945-2472

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