Hi,
I just thought I'd share my findings on the incompatibility of the HG633 with various printers. Mine in this case is the Samsung C460 Colour Laser printer.
It worked fine before with Sky wireless and had no issues.. When I moved to TT it didn't want to connect at all with WPS.
Upon playing with the WPS settings, I've fond that 8 characters or less for the WiFi name seems to gel with the Samsung printers (and maybe others). it seems that some devices don't like mor than 8 characters for wifi SSID names so what I did was:
1) rename my wifi 2.4 and 5.0 signals to: TTwxyz24 and TTwxyz50 and.
2) made sure that both were WPS enabled
3) fired away and voila, I had connection
So in short:
Not all printers are 9+ character friendly for SSID names 
And not all printers like both 2.4 and 5.0 Ghz signals having the same SSID... *phew* what a journey!
Anyway, I hope this healps the TT teams and anyone else with the same issues.
I tried this after renaming them each shorter by one letter at a time until...
Happy internetting!
Ade.