According to Google, they will disable the NPAPI by default starting in Chrome 42 scheduled to be released April 2015 (Reference). The NPAPI is used for TestArchitect 8.1 and below interacts with the app runs on Chrome.
Logigear has adapted with the Google's changes and released the build which supports Chrome 42 and above without using NPAPI. Please contact Support (firstname.lastname@example.org) to get the build.
If you are using TestArchitect 8.1 or below and want to test on Chrome 42 or newer versions, please follow the steps below to enable NPAPI
1/ Go to page chrome://flags/#enable-npapi
2/ At section “Enable NPAPI Mac, Windows”, click on the link “Enable” to enable NPAPI.
3/ Restart Chrome