Hi Matthew, I've been playing with metaobj and luatex 0.43 for a bit, and faced similar problems. Lots of stuff about "redundant" equations and other stuff I didn't understand.
However, I've found that cleaning up your objects when you're done pretty much
solves all my problems. For example, just add a clearObj line to your code
makes it work for me:
\startMPinclusions
input metaobj;
\stopMPinclusions
\starttext
\startMPpage
newBox.a(\sometxt{hello world});
a.c = origin;
drawObj(a);
clearObj a;
\stopMPpage
\stoptext
I'm not completely sure why this is clearObj a (and not clearObj(a), which
seems to be more logical considering drawObj also takes parentheses), but
that's probably something of the wonderful world of macro "programming".
Hope this helps,
Matthijs
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