I have this problem also. It used to work fine. I would say I have had the problem on all my evernote applications for about 2-3 months. There have been a few updates since the problem started. I have a very long note that I use Ctrl F to search everyday. The window will show the number of times the word/phrase is in the note, but will not advance. Now that I think about it, the note I search in most often is a table, but again, the search shortcut used to work fine.