Was unsure which forum it would fit better in, but there tends to be more traffic here, so it's worth a shot.

Basically, I assume it would be one of my mods, but no matter what route or path I take, Hadvar+Alvor or Ralof+Gerdur/Hod will start their little Riverwood dialogue, but never finish. Hadvar and Alvor never make into the house, they stand outside, while Hod chills out on the mill with Ralof and Gerdur standing below.

Anyone else have this problem / know what mod or mod combination causes it?

Always suspect the mods, always.

I will move this to Mods so you can get help.

Please post your load order.

It was the mod Dragonstand, turning this off allowed them to resume their schedules / scripts. Weird, liked that house too :<

I've got a rather similar issue going on myself, where certain scripts won't finish or the scripts to give/take things hangs up in the middle of everything and requires a save/load to kick it back into gear. Hadvar and Ralof also don't end up commenting on the standing stone I get at the first three, they just tell me to 'see for myself' and stand there like bumps on logs. My mods and loading order as said by Nexus Mod Manager is:

Skyrim.esm
Lycanthropy_Audio_by_Brevi.esm (for the Legends of Lycanthropy mod)
Update.esm
SkyMoMod.esm (Skyrim Monster Mod)
Unofficial Skyrim Patch.esp
Lycanthropy_Main_by_Brevi
Weapons and Armor Fixes - Hacks
Weapons and Armor Fixes
Krisan's Children
Deadly Dragons
Deadly Diversified Dragons Patch
Deadly Dragons Armory
Dragons Diversified
Amazing Follower Tweaks
Lightweight Poisons and Potions (0.2)
SkyRe_Standing Stones
SkyRe_Main
SkyRe_Combat
SkyRe_Races
SkyRe_Enemies
SkyMoMod_lists
SkyMoMod Extras Collectables

Bump hopefully

Update.esm should be after Skyrim.esm for starters.

It is. The list up there is the exact order that things are loading in for me. As for why Lycanthropy is loading between Skyrim and Update, the mod has the requirement of the location. Other info is that the 'issues' started cropping up with USkP and Kristan's Children were put in.