AVChat 3.7.5 is now available and fixes several issues. Details in the blog post.

Refund policy

Effective May 1st 2010.

If for any reason you are not happy with the software you can ask for your money back within 10 days of purchasing the software. Refunds are offered on a case by case basis. Refunds are not offered for services, upgrades and source files. To request a refund e-mail contact@avchat.net include the order number and the reason why you want a refund.