On a hunch, I uninstalled my web filter - Blue Coat K9. It's been great - effective and remarkably low on processor requirements - but for some reason the latest update started messing with things, it seems.
With Blue Coat K9 removed, all seems to be fixed.
EDIT: Did some more testing. It is in fact Blue Coat K9... even with all of the filtering options turned all the way off, the latest version blocks FSrealWX. I wonder what it thinks it is blocking?
Does anyone know of another good, lightweight, free web filter to use? It's for my only computer - FS, work, school, etc., it's all on the same machine, so it has got to be easy on the processor and on the memory. No stinking way I'm using bloated crapware like McAfee or Symantec!