Since the new Gmail came out, I've had nothing but nightmares with it. As I use the Gmail notifier, every time I go to my inbox it brings up the old version. Google should have allowed us to set the Gmail client to the old interface by default. Woes!
Anyway, I went ahead and edited the gnotify.exe file to load the old version by default. For anybody else unfortunate enough to be tearing their hair out.
Don't forget to back up the old one before you overwrite. Default path is: C:\Program Files\Google\Gmail Notifier on Windows.
The man who comes back through the Door in the Wall will never be quite the same as the man who went out.