Welcome to MR, erdem
I am sorry that your first official post is one with a problem.
I have the 505, but haven't ventured on to the new download of the Reader library. I have Vista on my book laptop and decided to wait until all the problems are sorted out.
There are a few threads around that have discussions about problems with the whole new Reader Library. You may want to check some of those out. I found that even though the thread title has one problem that the posters may post about another problem in the same thread and it gets responses.
Good Luck and enjoy your 300.