I noticed the shift key problem when trying to type a "?". It was primaraly when texting. I changed the AOSP to No Language(QWERTY) and and unchecked English(us) and now everything is working fine, even in Chrome. I have done nothing else. My caps lock seems to be working fine also. My only problem with 4.1.2 now is random restarts(another topic).
I tried this and I still have to hold down shift while pressing the letter in the browser on FB mobile

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