I have been using google sync succesfully for years between Outlook on my PC, Google and a Blackberry phone. The email account was a non Google account.
I then needed to use Google Talk so I set up a Gmail account and linked the two together in Google.
Ever since then I have been having sync issues.
When I started investigating, the gmail account seems to have become the primary account at Google (unsurprisingly) and I suspect that this is now causing the problems with only some appointments getting through either way.
Please can you advise whether this is likely to be the cause and if so, how can I switch the Primary Account? There is no option in settings to do this.