Hi Jonathan,
I'm an Independent Advisor here to help you out,
As neilplzz has correctly pointed out, you may have more luck on the Google forums a your issue is related to their products.
Before you go however, you may want to try these steps:
Go to Chrome Settings > Disconnect your google account
Close Chrome
Open Chrome and sign in again
Under the "advanced sync settings", change from "sync everything" to "choose what to sync" and temporarily uncheck any one of the boxes. Click "OK".
Change back to "sync everything" and ensure all boxes checked. Click "OK".
If that doesn't work, you'd be best opening a thread on their forums.
Best,
Nick