Ok, here goes.
First of all, the usual questions:
-Have you installed ToB?
-Have you patched ToB? (only apply patch 26498, not 26499, and no need to patch SoA first)
-Have you installed any sort of third party fixes? (e.g. fixpack, baldurdash, etc.)
-Have you installed any other mods?
Now, even assuming it's a properly patched and fixpack-applied game, Saemon can still cause problems even to this date.
There's many threads and posts about this on various forums. Here's a couple:
Post-Spellhold Brynnlaw Bug - The Gibberlings Three Forums.
Saemon problem - The Gibberlings Three Forums
Firstly, try
CLUAConsole:CreateCreature("ppsaem3") and see if that works. Unless you meant you can't open the CLUA console when you said 'the CLUA console won't work'? That would be a problem... (I assumed you just meant you couldn't figure out the right command to get Saemon to spawn)
Hopefully that will work, and, if you don't read those threads, the important things for next time for yourself, and anyone else, are:
-Wait for Saemon to leave the tavern after you agree to get the horn, before you rush out first.
-Don't try to save/quicksave the game during any such scene where other important actors are moving, and you think you ought to wait. This is a general piece of advice, not specfic to Saemon.