Hi Ingo,
at the moment, as soon as ROFF_ie is seen, r->stackpos is incremented.
This happens in roff.c 1028. But the corresponding code for handling
ROFF_el in 995 doesn't decrement it again. Shouldn't it be
	rule = r->rstack[r->rstackpos--];
in line 998?

Attached is a trivial example.

Joerg