This is just to make a long story short, my previous post was overly
elaborative; the following is what was important:

Can it be that imaging and restoring, and/or resizing partitions
changed all the suid-permissions to x-permissions?

- and -

How do I find out which files originally had the suid-bit?
I.e., after a fresh Slack-10.1 install?

- finally -

Your (Menno's) explanation of _suid_, not _chmod_, helped a lot! Thanks.

To clarify, I'm still a bit to Linux, and to Slackware especially

Cheers!

PJ