SU permissions issue in latest waldorf build 20120927

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http://crunchbanglinux.org – I recently updated to latest build of CrunchBang based on waldorf 20120927 build from earlier 20120804 build.I am having major issues regarding the following:- The thunar file manager cannot mount my windows partitions(i use dual boot), previous installation was able to mount the same. I have to manually mount from terminal. Thunar file manager in root mode doesn't help either.-  I am having issue with su permission. It works when i use sudo + command, but if i just type su, and i enter the password, it says authentication failed.- Some applications are frequently reporting files not (HowTos)