After upgrade from 3.9.3 to 3.10.2 AD users can't login with Spark 2.7.1 build 686, Spark says "Invalid username or password".
At the same time admin console login is successful.
In debug log and error log nothing is present about spark error message.
Server side Centos 6.6 x86, client side Windows 7 x64 without SSO.
Openfire 3.9.3 works with some noncritical issues.