I am on Windows 7. I am trying to convert them from .pdf to .mobi. THe whole calibre says not responding. I highlight them and click bulk convert, then it does its queuing thing, at the moment it is suppose to actually run the conversion part, it just comes up and at the top where it says calibre it says Not responding. I have let it sit for quite a while and it does not start to work by itself so then I have to go to task manager and click to end task. Hope this is enough info.
