Lack of storage space

Hi, I have 3 GB free from 4 GB of all and I can't install any app. Th eproblem began when I format internal disk to f2fs and install new ROM CM 12.1. After this ROM i formated internal and all its partition to ext4 and install new ROM Carbon in my signature. In both of this ROM it happened problem when I fill some space on the disk and then I can't install any app. (Error message: Lack of storage space). Yet I have 3 GB free and app has only a few MB.
I don't know if it's error of Android 5 or some wrong formating of disk but I tip some error in Android because I formated disk back to original form and the problem persists. In Adroid 4 it was all OK.
Please help.

Here I upload screerecord about this: https://www.dropbox.com/sc/pibe42i0w...CdM9uW-IK_h1za

Lack of custom ROMs for the OnePlus Two

The main appeal to me of purchasing the OnePlus Two rather than a Nexus was a combination of the hardware and the likelihood of a range of custom ROMs. The OnePlus One has heaps of custom ROMs available, however there are very few for the OPT.

Is this just because the phone is still fairly new, or is there another reason? I'm hoping it will change over time, otherwise I may have to consider the Nexus 5X.

I'd like to see some AOSP ROMs with layers support. Are we likely to see official CM nightlies with time?