Dennis,

PMFJI, but by "particular machines", could you mean "particular users"? Is it possible that these users are doing something that others are not? Nothing better than users to debug an app... :>)

>>>So Insufficient Stack Space is only or more of a software-related error than a hardware one?
>>
>>Yes, exclusively, I'd say.
>
>Any recommendations as to how to go about solving it? You see, it happens only on some particular machines.