I have a similar issue. I wrote an email (but got no answer, probably sent to the wrong guy) see below.
I always enjoy reading the PragPub magazine on my Kindle 3 (with keyboard). Thanks for this availability.
All my downloaded PragPub magazines get stored in a separate collection (called PragPub). However since around the 2011 July edition of PragPub this is not possible anymore (I’m not 100% sure about the date). While trying to add books to any collection, the younger magazines (like Oct or Nov 2011) are not visible in the list of books to pick. But the older ones (like Feb 2011 or Apr 2011) can be added (or removed) to a collection without any problem.
It took me a while but I noticed a difference between the older and younger editions: the displayed name of latter contains a hash sign (#) in the title, for instance:
PragPub 2011-11: Issue #29
While the older editions are just like:
This might be bug in the Kindle software though it is unlikely that Amazon will do something about it. Assuming that the hash sign causes this behavior, is there any change that you would stop using that character in the title of PragPub?
This would be really handy because I like to keep my books organized into collections instead of letting them cluttering the home page. Especially the PragPub magazines are great to keep. I already have re-read some them because of the great articles.
I’m willing to help in anyway if possible.
Many thanks in advance,