From the Microsoft website:
"The original version of security update 2753842 had
an issue related to OpenType Font (OTF) rendering in
applications such as PowerPoint on affected versions
of Windows. This issue was resolved in the version of
this security update that was rereleased on
December 20, 2012"
(More about the original issue here:
http://www.letterheadfonts.com/news/index.php?a=blog&id=396)
Looks like it is safe to install
all updates for Windows now.
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The fonts never disappeared, but just were not being recognized in some programs.
now I will install the new version.
tks