But when was your last fix and how far did you move since then?
... So I'd rather doubt that probs are caused by Googles PKI. Last root certificate changes for supl.google.com were in mid 2011 (from Thawte to Equifax/Geotrust).
... ... As supl.google.com has stopped working with N900 I started searching for other supl servers, unfortunatly there are not many around. I found supl.vodafone.com supl.sonyericsson.com sls1.sirf.com seemingly to be active. With supl.vodafone.com my dish icon stopped blinking after some minutes, so I'm fine with this. Didn't check the others for location data, just for propper TLS responses .