Kornel, I notice that loading up your document gives an error Unknown token, lyxsize_type, skipping. Unknown token, 1, skipping.
You should "fix" this with sed 's/lyxsize_type/lyxsize_kind/g' < ColMathXLII.lyx > temp mv temp ColMathXLII.lyx I know that you can now load the document fine, but you may have others where this occurs... ...of course, I still can't load the bugger ;-) Angus