My stacks cards and controls (on a Mac) are all four-digit. I do have a stack that is the core of a long term project that is five digits (25762). Not sure how it got there, since that is far above the number of cards and controls in all the stack files in the project.- stack has 6 digit ID
- cards have 5 digits ID
It is only important to know about these, not what their values mean. You cannot trust any order with ID's, unlike the number property, where order is often very useful and important.
That is why is doesn't matter.
Craig