Google has told Joy Hawkins that it has fixed all the reviews that disappeared over a technical issue. The statement she was given and she posted in the Local Search Forums was "All the reviews that have been removed for technical reasons have been reinstated. Any reviews that stay missing have been removed for policy violation and will not be reinstated. Please refer here to our policy."
The reviews issue started probably even before we reported about it earlier this month. Google said last week that they are investigating the issues around these reviews.
It is hard to say what percentage of reviews that "disappeared" returns with this bug fix. It is clear from the statement that not everyone should expect their reviews to return simply because Google feels some of those reviews are against their policies.
Did you reviews return?
Forum discussion at Local Search Forums.
