[Motorola Droid 4] Jishkah:
Wall of text incoming. I could probably condense this in a few sentences, but I figured that describing the entire process would be ideal.

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Here's an update with the recent builds. Mind you, this is all in regards to a clean install - when giving me the option to choose from a list of backup profiles, I set it up as a new device. For the sake of giving context, I'm also going to describe my normal setup process.

Typically, when I perform a clean install of a new ROM - which, in the case of the 20150907 Nightly, is what I did - I usually reset the phone immediately after performing the first boot setup, and perform a Dalvik Cache/Cache wipe, in the process. I do this for two reasons: reason #1 is that it triggers my phone to update the Google Play Services framework, and the second reason - more specifically, the reason as to why I perform the Dalvik Cache/Cache wipe, as well - is because, if I don't, MMS functionality breaks. Whenever I need to reboot the phone, I always perform said wipe, for that reason; for the most part, it seems to fix a lot of minor bugs.

Anyway, after resetting the phone, I typically enable Developer Options, change a few minor settings within said Developers Options (Advanced Reboot Options, Show All ANRs, and the option to enable a long-press of the Back Button to force close an app), and then I'll configure the settings from within the Google Settings app and the Settings app to my liking. Nothing too drastic, but certainly comprehensive - it takes a while to get everything precisely the way that I want it to be set up.

From there, I'll configure all of the apps within the app drawer. I'll change a few settings - again, nothing drastic, but comprehensive enough to make a difference - and then I'll download the rest of the apps that I'll want from the Play Store, setting those apps up, as well. Once all is said and done, I'm ready to use my phone - the entire process takes several hours, for the most part, with a good chunk of that time being spent downloading/installing apps, and moving apps over to the SD Card, when I need to.

Anyway, with the 20150907 Nightly, everything seemed to work fine on the first boot - but things quickly went downhill after rebooting the phone for the second time. After getting all of my apps downloaded, installed, and transferred onto the SD Card (at this point in time, I had not yet configured any of the apps from the Play Store, yet), I reset the phone, knowing that I had abused the phone quite a bit by doing so much on a single boot. Anyway, as I typically perform the Dalvik Cache/Cache wipe on every reboot, I always get the "Optimizing App ?/?" dialogue window - in this case, however, it only showed 101 apps, meaning that it didn't grab the apps from the SD Card during the boot process. I'd like to assume that this is probably because the phone couldn't mount the SD Card on time before the optimization process began, so it's not as much a bug as it probably is just me having a slower SD Card.

After that was done, and after waiting a good ten minutes for the apps on my SD Card to populate within the app drawer, I noticed that my phone was having a hard time maintaining a data connection - and on a related note, WiFi was disabled. I reset the phone, again - same thing. Same problem.

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So. To summarize the bugs that I've found so far:

#1.)

MMS doesn't typically work after a "normal" reboot; wiping Dalvik Cache/Cache seems to fix this. Has been a problem since CyanogenMod 10/11, but it hasn't been a "problem" until CyanogenMod 12, where it takes a super long time for the post-boot process to finish.

#2.)

When forcing Android to re-optimize apps (typically in the form of a Dalvik Cache/Cache wipe), it doesn't grab the apps transferred over to the SD Card, in the process. The SD Card probably just doesn't have enough time to mount before the optimization process begins; not a big deal.

#3.)

Phone took a while to latch onto Data. Seems to have fixed itself, but it did take a long while.

#4.)

WiFi doesn't always work after rebooting the phone. Seems to be hit-or-miss; my first reboot kept it working, but everything after that breaks functionality.