Hey all,
Fish got me a message, letting me know my iron farm was causing a problem by lagging the server. Attracting too many zombies that would not despawn while someone afk's at it. I am still relatively new to playing in a MP Minecraft environment, and not fully versed in all the things that cause significant server lag. If I had realized my iron farm was causing a problem, I would have corrected it long before this!
I came home between appointments to log Fronk out, and I have let him know what's going on. Neither he nor I will be afk'ing there until I can more properly mob-proof the area. I will check in with folks more MP-experienced than myself before opening my iron farm back up for afk'ing.
Very sorry for the trouble, everyone! :-[
-Lad
No worries, thank you!