I have the same problem.
Phone: Huawei Ascend Y300
Android: 4.1
Non rooted
Avast last updated 30th of July
Avast : 2.0.4993
Anti theft version: 2.0 Build 4838
I've tried to update but I get the message that I already have the latest version installed.
Another thing is that the "Phone number" has reverted to an old number from a SIM card that is no longer present in the phone.
Both numbers has been set as trusted, both the SIM card not present in the phone and the SIM card present in the phone.
Any suggestions?
Best regards