[OS X TeX] TeX capacity exceeded

[Leslie Morland (MTH)]

Help, never seen this message before, with [grouping levels=255].

Only a short mathematical paper, first stopped at line 407, then at same line 365 after removing an earlier section. Cannot see what to do in Preferences.

Leslie
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Professor L.W. Morland
School of Mathematics
University of East Anglia
Norwich NR4 7TJ
l.morland at uea.ac.uk