http://getsatisfaction.com/firemint/topics/it_wont_start_on_...

The "receipt" file generated by Mac App Store should have been called Receipt. On case sensitive file systems, the users will get the nasty error.

What I don't understand is, what fixes have the developers made in the update they submitted to apple, so that it works?

Here is another one: http://pariahware.com/blog/?p=359

Any ideas?

My guess is your (as well as those links above) development and testing platform is case-insensitive and thus missed this.

Contents/_MASReceipt/receipt

and returning 173. Now we are going to be looking for that, and if not found, try looking for /Receipt.

According to http://getsatisfaction.com/firemint/topics/it_wont_start_on_... it is actually Receipt.

I don't know, which one is it? I am worried that it might be one of the OTHER places where 173 is being returned. Such as if Apple's Root CA is missing.

I thought that whole /receipt thing as autogenerated by apple.

Apple signs with their own certificate when posting on the MacOS store. We were checking for OUR own certificate (the one we used to sign when submitting to Apple.)