edited:
nevermind. just did it again, and it's working. added new event to outlook, it updated google, then my phone... added new event to phone, it updated google, then outlook.
strange things, man.... strange things.
maybe try uninstalling google sync from your PC, then reboot, and download again. Keep in mind that Outlook probably has to be open/running in order for the sync to work. Also, the setup/sign-in screen for sync is a little misleading ... it asks for your email, and I think my initial problem was that I put in the @gmail.com part. Because you're using GOOGLE sync, it should be understood that it's @gmail.com and therefore unnecessary. So just put your GMail user name, and leave off the @gmail.com part.