Did you solve your issue?
Did you try the flashing of SuperSU and Superuser?
What solved mine was after updating to 4.4.2 (I have a Note II), it changed the way external was written to. I noticed the tibu folder was not writable and I wasn't even allowed to change permissions via root explorer. After some digging, I found this thread http://forum.xda-developers.com/show...php?p=44370296 which explains to modify platform.xml.
After editing the file and rebooting, no more issues with "insufficient free storage space".
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