I can say that for sure, simply installing quick settings on my out-of-the-box LG Optimus Elite--without even enabling the wifi hotspot feature--caused me to run into the Error 67.So don't install "Quick Settings" even if I don't use the hotspot feature?
I currently have an Optimus V and use Quick Settings for the basic features but ordered the Elite today so I want to make sure.
That MIGHT have been fixed with the Aug 2012 OTA firmware update, but I have not decided that it's worth the headache ATM for me to test it.
If I were you, I'd be tempted to: unbox the phone, install the latest OTA firmware update, then install quicksettings, activate the phone, and see if I got the error--if I got the error then all I'd have to do is call CS to get the MSL and conduct a factory reset--since I'd have no data/personalization, I wouldn't have lost anything.