[maxmsp] cellblock+wave~ crash max

i'm using jit.cellblock to switch the corresponding buffer of a wave~  
object (with a "set" message).
but this crashes max on my computer (ppc osx 10.4.4, maxmsp 4.6.3,  
jitter 1.6) as soon as the dac is on.
using [play~] instead of [wave~] doesn't crash.
could someone please test, if the attached patch crashes on other  
machines, too?
thanks,
volker.

#P window setfont "Sans Serif" 9.;
#P window linecount 1;
#P newex 38 212 64 196617 phasor~ 0.3;
#P comment 71 34 100 196617 1. turn on dac;
#P comment 241 134 100 196617 crash...?;
#P window linecount 2;
#P comment 241 109 100 196617 3. click here to switch buffers;
#P window linecount 1;
#P comment 93 131 27 196617 OK;
#P user ezdac~ 81 52 125 85 0;
#P newex 169 188 32 196617 print;
#P user jit.cellblock 169 108 238 137 3 9 1 2 86 14 0 1 1 0 1 0 0 0 1  
0 0 0 255 255 255 0 0 0 0 0 0 191 191 191 0 0 0 215 215 240 1 1 1 0 4  
0 0 0;
#N vpatcher 224 360 496 638;
#P window setfont "Sans Serif" 9.;
#P message 74 49 20 196617 \$2;
#P newex 74 154 62 196617 prepend set;
#P newex 88 120 25 196617 t bb;
#P newex 74 74 41 196617 sel 0 1;
#P newex 74 97 25 196617 t aa;
#P inlet 74 26 15 0;
#P outlet 74 201 15 0;
#P connect 1 0 6 0;
#P connect 6 0 3 0;
#P connect 3 0 2 0;
#P connect 2 0 5 0;
#P connect 4 0 5 0;
#P connect 5 0 0 0;
#P connect 3 1 4 0;
#P pop;
#P newobj 169 154 47 196617 p setBuf;
#P message 106 144 37 196617 set bb;
#P message 68 144 37 196617 set aa;
#P newex 68 188 53 196617 wave~ aa;
#P newex 240 209 87 196617 buffer~ bb 100 2;
#P newex 240 189 87 196617 buffer~ aa 100 2;
#P comment 63 120 100 196617 2. switch buffers;
#P connect 14 0 3 0;
#P fasten 6 0 3 0 174 179 73 179;
#P connect 4 0 3 0;
#P connect 5 0 3 0;
#P connect 7 0 6 0;
#P connect 6 0 8 0;
#P window clipboard copycount 15;