Did something happen to PragPub between Issue 23, May 2011 and Issue 24, June 2011? My Kindle is able to add PragPubs to collections up to Issue 23. The three issues beginning with Issue 24 are not found by my Kindle when attempting to add items to a collection. What happened?
The files are marked as periodical magazines (they were not originally). The device does not allow putting them in collections, only “books”.
Interestingly, I just found out desktop Mac OS Kindle app does allow it (but has no effect in the physical Kindle).