I have updated today to version 1.22 of SMT.
After plugin update my all page fields are gone blank. Looking at the code, the output is blank either. Only on the Posts page meta info has been preserved (in the admin panel) but the encoding is broken (mine page is in Cyrillic).
Please analyse the issue. In fact it is a matter of a small site in my case, but i do maintain bigger sites (using older version of WordPress and Page-meta plugin). Such a problem never occured.