Hello!

I get stuck with some nasty bugs on northern part of Lycanthrope island.
Basically every NPC other than Karoug and Dradeel won't talk to me. With Palin or Kryla I just hear npc voice, but nothing happens.
Also Dradeel won't take his book from me, he's just crying to find it (it seems that quest didn't start properly because I lack journal update and amulet from Dradeel).

I tried reloading and restarting game before entering north area several times. While ago I tried baldurdash FixPack 1.1 but it didn't help. Is there any way to fix this without starting new game (I went to Ulgoth's Beard in 7th Chapter so...)?

I'm running vanilla BG:Original Saga and never used console nor save game editors.

Are you running the GOG version? If so, you should not install Baldurdash at all. Do you have any other mods or patches installed? Do you have a save from prior to going to the Isle of Badlduran? Did you speak to Kaishas before going north or talking to others?

I use GOG version, and I don't have other mods or patches - in fact I installed Baldurdash after second reload of north area.

Yep - I have save from prior.
On Island I first speak to that kid NPC who sens you to Kaishas, then to Kaishas and then with everyone else in village.

Do you have the console enabled, and do you know how to use it? If so, try this...

After you have spoken to Kaishas, and before going north, type
SetGlobal("kaishas1","GLOBAL",1)

After speaking with Palin, or while standing next to him (if you cannot speak), type
SetGlobal("PalinMove","GLOBAL",1)

After speaking with Kryla, or while standing next to her (if you cannot speak), type
SetGlobal("KrylaMove","GLOBAL",1)

Then you have either a corrupt save, or (more likely) a corrupt installation. Since you have the GOG version, I suggest you completely uninstall the game and re-install, with no mods or patches. You should still be able to use the save, since you said you have no mods. If it still doesn't work after that, then your save is corrupt.