For what it’s worth, there is a store of Companion and Emulator
experience at FAQ Section: Companion and Emulator
I have not seen your symptoms in any of those cases, so I am escalating your post.
I just retried GenyMotion Free (now GenyMobile) on my Windows 7 PC with the latest Emulator.apk download, and it works against the ai2 server after replacing the AI2 adb.exe with GenyMotion’s more modern adb.exe file. I connected via the Connect->USB pulldown against a Genymotion instance running the Emulator.apk Companion app, with its legacy connection checkbox enabled.