The ``Maximum Calculation Depth Exceeded'' erro can occur when you
reference other cells in calculations. For example, if you have: 

\texttt{G0 = Some_complicated_expression\\
 X0 = G0>2?1:0}

Try replacing \texttt{X0}'s contents with \texttt{[
(Some_complicated_expression) > 2]?1:0}. In other words, replace the
reference to \texttt{G0} with the actual contents of \texttt{G0}. That
might fix your error by removing one level of indirection that
LON-CAPA must process in order to compute the result.