Hello there. Given the following minimal example: \setupbodyfont[11pt,libertine] \starttext test \stoptext (where the libertine don't have the math fonts) In the logs I found the following problems: fonts > fallback modern mm 11pt is loaded fonts > defining > forced type afm of stmary10 not found fonts > defining > font with asked name 'stmary10' is not found using lookup 'file' fonts > virtual math > unable to resolve name mapsfromchar fonts > defining > forced type afm of stmary10 not found fonts > defining > font with asked name 'stmary10' is not found using lookup 'file' fonts > defining > forced type afm of stmary10 not found fonts > defining > font with asked name 'stmary10' is not found using lookup 'file' While I was updating the minimals I noticed the deletion of stmary10. Until April 3rd this problem (even if so far I didn't encounter compilation errors) wasn't present. Best regards (and cheers for the release of luatex 0.66) -- Marco