Myron,

     sounds like your laminate has not been cured properly at the inner layer 
bonding process of PCB manufacture. Are there any delaminations visible? Does 
the build of the PCB meet the spec for the part ie dielectric thicknesses. Is 
the section around  the holes thin, sometimes you can get colour distortions if 
light is shining through the section. Can you check back with your PCB supplier 
to ascertain the Tg of material used.

Just some questions you might like to ask yourself that might help you find a 
solution.

Good luck

Regards

Kenny Travers

Digital
mosshill Ind Est
Ayr, Ayrshire 
Scotland

e-mail  [log in to unmask]

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