You should delete all cache-files (or rename direktory) to see what happens then. In some cases ther are faulty data, which prevents Wayfarer from working well on some websites.
At another issue in the past I had to rename file settings/settings.json to work propper. You can try it. If it's not solving your problem, rename it back.

Btw:: Paypal or Ebay is working flawless with V6.5......