I had to read your post 5 times Gil,
After which, I went to my partition that has a stock slackware 10.2 install, full noobie..2.4.31 kernel.
I then threw in a network card, linksys lne100tx (as 2.4.31 does not work with either on-board network cards on asus nforce 2 motherboard)
Rebooted, then ran slapt-get on the primary mirror.
Copied over my samba's conf file...from my daily slackware partition. Threw it into /etc/samba folder.
Rebooted....and boom...dropping packets like mad to a different patched slackware box 10.2 that's fully updated and running 2.6.15.3 kernel.
So I dumped the 2.6.15.3 kernel, and restored via powerquest drive image to stock 2.4.31 on that boxen, and copied over the samba.conf rebooted...
and dropping packets to the other one.
Rebooted my switches and hubs, routers, dsl modem.
Changed wires last night so I know their good.
Even though I know that SUSE and Mepis talks to both slackware boxes and drops packets when slackware is updated and does not when they are 2.4.31 kernels.
The heck with it...I'm just gonna use NFS..and and external hard drive if I gotta move stuff.
Apparently I'm the only one with this issue on slackware 10.2, so I give...