Note, this issue is similar to --#6463.
cc @bramd @dkager

Steps to reproduce:

Work with Outlook mail composition or MS Word. Seen in Office 2016, 2013 and 2010 at least. There isn't a known way to trigger this behavior, which makes this hard to reproduce reliably.

Actual behavior:

NVDA freezes and the keyboard is locked up in such a way that it is not possible to restart NVDA. The only way to break out of this situation is signing out and back in again, however this effectively means that you're losing data. As the keyboard is locked up, it is not possible to use alternatives, like running Narrator.

Expected behavior:

No freezes.

Comparison with #6463

Note that since #9208 was merged, the test case from #6463 still allows me to escape/restart NVDA. However in the Word/Outlook freezing case, there is really no other way to escape than sign out/in again.

System configuration

NVDA installed/portable/running from source:

Installed

NVDA version:

All recent versions of NVDA< for at least a year.

Windows version:

Several versions of Windows 10

Name and version of other software in use when reproducing the issue:

Office 2010, 2013, 2016

Other information about your system:

n/a

Other questions

Does the issue still occur after restarting your PC?

Yes

Have you tried any other versions of NVDA? If so, please report their behaviors.

Yes