Our plug-in's interface has a button to launch our company's homepage. We load our page's link as a URL, and use the launchInDefaultBrowser() method to open it. So far, I have confirmed that it works on every OS X host that I've tested, and REAPER on Windows. It is not working on the following configuration:
Windows 8.1 (64-bit)
Ableton Live 9.1.7 32-bit
I've tried launching Ableton as Admin to see if that fixes it. It does not.