Bug report and Settings crash on Nexus 4 My Nexus 4 is rooted with stock ROM (version 4.4.4) and custom recovery TWRP. Recently it automatically generated some bug report: one is a png image (just a blank screen in black) and another text file in 9MB. Since it's a huge file, what should I look for in the text file?

Also there is another problem on my Nexus 4: Settings keeps crashing when an app is selected under Settings/Apps with error message : "Unfortunately, Settings has stopped." It's described in details here. I'm not so sure if the two problems are related. I've tried to re-flash the factory image of 4.4.4, but the problem remains.
Don't know about Settings issue but the bug report thing is pretty popular: Google's devices do a report now and then (don't ask me why.... maybe those reports are sent to Google to keep everything under control or to check if something goes wrong) so just don't worry. 
On my Nexus 5 I can even make a bug report everytime I want (just by pressing power+volume up at the same time) and you should have the same feature.
It basically depends on the activation of USB Debugging: if it's active, then the bug report creation is active. 
You can disable it by simply disabling USB Debugging or by going into /system/bin and renaming bugmailer.sh to bugmailer.sh.bak or deleting it. Then just reboot and no more bugmailer. 
Let me know if this helped you someway :)

P.S.: for the Settings issue just try the simplest thing: go into the app drawer -> long press on "Settings" app -> move it to the upper side (App Info) -> clear data. 
I feel optimistic and think the problem will disappear ;)