[XeTeX] Old to LaTeX New to XeLaTeX

[Dr J.D. Billett]

Greetings to all.  I recently completed a Ph.D. dissertation typeset  
in LaTeX, which is to be published later this year.  The publishers  
would like me to produce camera-ready copy (in Times New Roman), and  
I'd like to clean up a few scrappy fixes that I judged acceptable  
only for the never-to-be-read-again copy I submitted to my  
university's library.  These have especially to do with non-standard  
characters for transcribing Old English and medieval Latin  
manuscripts.  The readers of comp.text.tex pointed me to Xe(La)TeX as  
a straightforward means to accomplish these goals.

I have been playing around with XeLaTeX for the past couple of days,  
and I am really impressed.  I am hitting some snags, however, in  
applying it to my dissertation.  Namely, I get a lot of error  
messages that don't come up with ordinary latex passes.  It seems  
that I can hit <enter> repeatedly to get through these, and there is  
a big pdf generated at the end.  But I haven't been able to check  
whether something is going really wrong in the output, and in any  
case it's not an ideal situation.  Given the length (nearly 8,000  
lines) and the large number of package calls and macro definitions in  
the preamble of the input file, I'm concerned that I may not be able  
to isolate the problems.  But I thought it would be worth a shot to  
see if anyone on this list could offer some advice about known  
conversion hiccups.

To give an example, this is the first error message that comes up,  
and it has to do with my definition (in the preamble) of a new series  
of footnotes (available in the memoir class) for use in tables:

! No room for a new \count .
\ch at ck ...\else \errmessage {No room for a new #3}
                                                   \fi
l.380 \newfootnoteseries{T}

Here's the apparently offending portion of the preamble:

\newfootnoteseries{T}
\paragraphfootstyle{T}
\renewcommand{\thefootnoteT}{\alph{footnoteT}}
\newcommand{\tbfn}{\makebox[0in]{\kern 4pt\footnotemarkT}} % <  
footnote marks in tables

I already have the etex package called (the first to be called of  
any), and this problem doesn't up with latex passes (there's no  
difference in this error if I "uncall" etex either).  Is there a  
difference in XeTeX that I can compensate for somehow?

Many thanks indeed for your time.

Jesse Billett