Preferences Panel Not working

When I open the preference window of The Unarchiver, I couldnt check unchecked checkboxes and uncheck checked boxes. In other words, I cant change settings. Besides that it comes with “Zip,7-zip,Rar and others” extensions selected which are commonly used. in my case I wanted to use with Bzip2 which I cannot select. :-/

( Yosemite 10.10.2. The Unarchiver 3.9.1)

Freddy Sulbarán about The Unarchiver, v3.9.1