Some users recently reported that they were unable to start Postman (both packaged and legacy apps) after the new Chrome v34 update. On clicking the app icon, the Postman window opens but neither the history data loads nor are requests sent. The console would show you a bunch of scary errors:
One of our users was kind enough to let me debug this problem through Team Viewer. After digging around, I found out that resetting Chrome flags fixed the issue.
In r166627 and r166494, we changed CSP 1.1 to block certain CSSOM operations if ‘unsafe-eval’ isn’t present in a ‘style-src’ directive. This seems to be incompatible with the web; it broke every site using jQuery, GitHub, etc.
So, all you have to do is go to chrome://flags and reset everything to defaults. You can try disabling experimental web features too but just to be on the safer side, I would suggest resetting everything.