Steps to reproduce:

1. Install NVDA Version: next-15126,d5e58ddf
2. Launch Becky! Internet Mail and focus a list of messages.
3. Try to navigate with arrow keys.

Expected behavior:

NVDA should read list columns such as subject send date and from

Actual behavior:

An error sound is played. I am attaching a fragment of the log with specific error.

System configuration:

NVDA version:
next-15126,d5e58ddf

NVDA Installed or portable:
Installed
Other information:
It is probably caused by #8190. The problematic column seems to be the first column, which contain graphical presentation of the message state read, unread etc. I am also attaching developer info for this column.

Windows version:
Windows 8 x64

Name and version of other software in use when reproducing the issue:
Becky! Internet Mail version 2.74 [en]

Other questions:

Does the issue still occur after restarting your PC?
Yes
Have you tried any other versions of NVDA?
Yes next 15121,7fcd6fe7 and it was possible to read this list.
Issue.zip