Can you be more specific? I'm using the module with Moodle 1.9.10+ and it works flawlessly... What are your symptoms?
In my case I upgrade to 1.9.11+ and all the attendaces in my courses disappear.
I unzip again the attendance_package.zip in my moodle's root, all the attendace in my courses show it again.
The attendance module has an update, so I download it again from: 'http://moodle.org/mod/data/view.php?d=13&rid=1062&filter=1'