[pstricks] Random ps2pdf errors

[Luis Sequeira]

Hi


I am writing a largish Calculus text, with lots of pictures. The pictures are done is pstricks, and are \input'ed in to the main text.
I can handle pstricks just fine, and the pictures are beatiful.

I also use a few inline pstricks commands (mostly \psbrace to underline important steps).

I have reached a point where a document typesets perfectly, then I add a word or a math environment (without *any* pstricks code in it) and then ps2pdf chokes, giving me a postscript error. 
There is no error in the latex side.

It may be something as absurd as this (somewhere in the middle of the text, in paragraph mode, so I can't produce a complete minimal example):

(typesets ok)

    Let $X$ be a subset of.

(postscript error)

    Let $X$ be a subset of $A$.



Sometimes slightly rephrasing allows me to go ahead, and then the error pops up again sometime later.
I am thinking that at some point an out of memory or overflow condition may be happening. 

Any hints will be greatly appreciated. Also, is there a more suitable place to ask this question?

If possible, cc: to me, as I am on digest mode.

TIA

Luis Sequeira

ps:

The error I get is this:

### /usr/local/bin/ps2pdf14 /tmp/altpdflatex.22757-1350899854/CDI1-texto.ps /tmp/altpdflatex.22757-1350899854/CDI1-texto.pdf
Error: /undefinedresult in --atan--
Operand stack:
 --nostringval--   Alpha   0   0
Execution stack:
 %interp_exit   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --nostringval--   false   1   %stopped_push   1894   1   3   %oparray_pop   1893   1   3   %oparray_pop   1877   1   3   %oparray_pop   1771   1   3   %oparray_pop   --nostringval--   %errorexec_pop   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --nostringval--
Dictionary stack:
 --dict:1157/1684(ro)(G)--   --dict:0/20(G)--   --dict:153/200(L)--   --dict:206/300(L)--   --dict:112/200(L)--
Current allocation mode is local
Last OS error: 2
Current file position is 1340664
GPL Ghostscript 9.05: Unrecoverable error, exit code 1
### FAILED to generate /tmp/altpdflatex.22757-1350899854/CDI1-texto.pdf ()