He has several workarounds in the meantime as I've set him up with both Google Authenticator, SMS codes, backup phone number and printed codes, but it is somewhat embarrassing after having convinced him to part with £41 because of the ease of use of the Neo compared to having to get his mobile out, fire up Google Authenticator etc (3) I forgot to mention this in my original post, but I have tried it with the extension installed (even restarted Chrome, just to be sure) but it made no difference. On the Mac it simply stays solid and the applet times out. (2) As I've got a Neo myself and use it regularly with Google Apps, I'm familiar with having to wait until the light starts blinking. (1) There wasn't anything on screen to indicate that something was being blocked (usually quite obvious), but I can try it again when I visit the client again next week. Whilst it was active, the 'Available Apps' list was populated.

I did enable CCID at first, to see if that remedied the problem, but as it didn't I disabled it again he has no need for the CCID functionality and as it (seems to) disables the green light in OTP mode (which he uses too) it would only lead to confusion.

I have tried it on the demo page but the same thing happens: the light stays solid green and doesn't start blinking, even when left for a while.

Google chrome yubikey