Preview often quits unexpectedly
When I use Preview to read a PDF-formed document such as a user guide from Apple ,it often quits unexpectedly.In most cases,scanning is whatever ok,while highlighting some words or typing something new in notes always lead to quitting unexpectedly.Additionally,the handles above are sometimes paused by a multi-colored windmill blowing,and then it's quit again,again,again.
I guess something is wrong during the process of saving new operation.Moreover,the same issue on my imac(2011) just appears from macos 10.7.4 to 10.8.2
I hope someone could do me a favor with this.Many thanks.😝
iMac, OS X Mountain Lion (10.8.2)