I just found out that seq~ won't work (on a G5 and a MacBook Pro, both running 10.4) at 1 sample per signal vector. Is this a bug or is there a viable reason for this? Also wondering if anyone found this to happen with any other MSP objects.

very-small-signal-vector-sizes

maxmsp at such small vector sizes at least gets very slow. try making your patch part of a poly~ and assign the smaller vector size to the poly~ instead of the main patch.

On max 4.6.3, I found that many objects (including +~ and *~) won't work for vector size of 1 & vs2, outside of poly~.

Very small signal vector sizes