Same here. Calisca is especially noticeable. Realtec HD Audio onboard card. GOG version.
The problem fixes itself after closing the client and restarting, only to appear again some time after. I am yet to figure out the cause.
Edit: It seems that double clicking to equip something triggers the bug. Seeing how it also causes some special abilities/bonuses to permanently disapper, it is highly adviseable to avoid it at all costs until the issue is patched.
Steps to reproduce:
1. Start the game (in my case as a Ranger)
2. Equip and unequip any item with a double click (in my case the bow)
3. Talk to Calisca.