in my modest opinion, 28 april 2013 cm9 nightly goes very good. i have been with it next to 2 weeks and i havent found any bugs/problems/errors. this is what i installed on my lg l3: http://oi42.tpnotallowed.com/1p6j2v.jpg
im stupid and i didnt read carefully where you said "external sd". i was using internal sdcard and thats the problem.
this is unveliable but its true, how a few files can make 1000 times better a phone.
really appreciate the hard work. no crashes in the few hours i have been testing it. awesome.
i have found only two "problems":
1) the first time i format the external sd card, with delete button, in settings/storage i believe. after that, the phone didnt recognize more the external sd card. i solve flashing stock firmware, formatting the external sd card in stock and doing again the cm9 process. go fine now. but since now i will delete manually instead of format. its not a problem after all.
2) about the 1000 mhz processor. it doesnt save the setting. it only keeps in that frequence when you turn on the phone and change the setting. if you turn off the phone, the setting doesnt keep save. its not a problem either, it can be changed when you need it and that all.