Shadow clipping in Lightroom 3: how can it be avoided?

Hi all,
I'm new to the forum, and I hope some of you can aid to clarify a doubt and to solve a problem. I' m starting to catalog my scanned images, and many of them are Tiff files with embedded input profiles (in Prophoto RGB color space). Many of these images show clipped shadows in Lightroom 3, and this is apparent by the histogram (I know, this could be misleading, I have read previous messages about problems with the histograms in Lr); furthermore, these shadows cannot be recovered by increasing exposure or in any other way. However the same images, opened in Photoshop Cs4, do not show any shadow clipping, and the same dark areas that in Lr3 appear to be clipped, here can be "opened" by increasing exposure. This problem is apparently limited to Tiff files (with embedded color space), I did not see any problem with DNG files.
Someone know if there is a way to avoid the problem, and to have unclipped shadows in Lightroom?
Regards, Maurizio

There have been many people reporting here that all shadowrendering issues
in Lightroom completely disappeared after selecting a matrix profile instead
of a LUT profile. I don't have the problem myself, but it clearly is real.
Lightroom cannot grok certain monitor profiles correctly that Photoshop can.
It might be something specific to the calibrator software that they were
using. Granted what happens generally for those folks reporting issues is
that the shadows are too light, posterized or even have a tint to them
compared to the rendering in PS. I have not heard of anybody getting clipped
shadows. That really sounds like a black level being dialed in where it
should have been zero for tiff files.

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