I have a Macbook (13 inch, mid 2010) which has been upgraded to 10.9 If it is connected to my home network, where I am sharing various hard drives with an iMac (also upgraded to 10.9) it won't shut down or restart normally - I have to do a hard shutdown. If it is started up not connected to the network, it shuts down without difficulty. If I disconnect from the network by turning off the wifi, it won't shut down. There are no applications running on the Macbook when I try to shutdown. Looking at Activity Monitor, there is no obvious difference between the main processes running when connected or not connected to the network. Perhaps there are processes on the iMac which are accessing the Macbook and won't release the Macbook but this problem did not happen under 10.8 .... Any suggestions.