[pdftex] Collision colorstacks of pdftex-1.40.1 and beamer/pgf?

[Victor Ivrii]

I discovered a strange problem with beamer and pdftex 1.40.1 which was
not around with 1.30 (not tested with 1.40.0): starting from the
really large page (slide) [something around 170] the textcolor in the
body becomes transparent (not the case with other colors, like cvolor
inside of the theorem, and the only solution I discovered so far is to
put \color{black} at each frame or sometimes even after each \pause. I
observed it with two long talks I tried. However in the latest run it
happened even on page 20!

Example uploaded to
http://www.math.toronto.edu/ivrii/beamerwoes/

(with all generated files)

I am reporting to beamer at the sourceforge as well
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Victor Ivrii, Department of Mathematics, University of Toronto
http://www.math.toronto.edu/ivrii