Im not sure if the iOS store is the same,  but what happens on the Mac App 
Store is after an update is released any reviews for the old version get pushed 
back to a second tab and a note says something like 'there are no reviews yet 
for this version'.  You can still click on the tab to show the old reviews, 
they dont vanish completely.

What also happens is,  say for example you have 10 ratings,  average 4*,  the 
new version retains this 10 review & 4* rating on the front screen, until you 
get 5 more.  Once you have another 5 ratings (they dont have to be reviews,  a 
* click will do) the front screen shows you have 5 reviews and shows the 
average rating of those 5 so you can have an app with 50 reviews and a 5* 
rating drop down to 5 and a 3* review overnight if the update is not received 
well.  If you go into the description and click on the old reviews you get a 
full total (15 ratings + average).

Now just to add one more scenario,  when you update again,  the new version 
will show the 'no reviews for this version' message,  but the counter on the 
front screen and the average will be set to all reviews again,  so in this 
example 15 ratings and 4*.

So,  if you put out an update and someone writes a silly review,  another 
update will push that to the second screen and include it in your 'all time' 
average,  but if you have a really good set of reviews and ratings for the 
current version it is quite scary to put out a new release as all that 
disappears and you are at real risk of a silly review taking all the limelight.

Its made worse by different countries having quite different take up rates.  
Ive found it doesnt take long to get 5 reviews in the States,  but it can take 
much longer in Canada or the UK and an update hides all the reviews so most 
users will not see them!

Hope all that makes sense!

Andy


On 6 Jun 2011, at 19:21, Darren Jones wrote:

> Maybe i'm mistaken, but i'm pretty sure when I updated an app last week, in 
> the 
> changelog the developer had written "Please leave more reviews as they 
> disappear 
> after update"
> 
> I've tried Googling it, but can't find anything.
> 
>> Then reviews are unusable. That cannot be the case. How could any app that 
>> has 
>> been updated ever have reviews?
>> 


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