This is another one that bugged me a while ago, and now again.
Let sr=22050, kr=25, ksmps=882, then:

 | Csound Version 3.44 (May  1 1997)
 | orchname:  /tmp/tkunze.protozoo-new.cec.orc
 | scorename: /tmp/tkunze.protozoo-new.cec.sco
 | sorting score ...
 |         ... done
 | orch compiler:
 | 856 lines read
 |         instr   10
 |         instr   20
 |         instr   21
 |         instr   30
 |         instr   40
 | MIT Csound: 3.44 (May  1 1997)
 | indexing overflow error

kr=50, ksmps=441 works...


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______________________________________________________________________

Tobias Kunze                       t@kunze.stanford.edu
CCRMA, Stanford University         http://www.stanford.edu/~tkunze