update - software manager doesn't work anymore

hi. today i did un update with software manager. I had M5 installed. I don’t have factory enable but nevertheless I found a kernel update and many more packages. Irebooted and since then I am not able to use software manager anymore. the error message “couldn’t load plugin gtk_pkg…”
now. how can I reinstall software manager using zypper? or downgrade it to the previous version?

Boot to level 3, login, become su and start: yast

You might be able to work form there.

is it only an impression or since m5 the updates are greatly broken? even kernel desktop has dependency problems now… shouldn’t all the updates be in factory until they are stable enough to pass in 11.2?