After I have upgraded from Open OS 16.06 to 16.08 successfully, happend follows…
All folder with files (except "Android", "Lost Dir") disappeard from SD Card.
I create a new folder with Amaze. After reboot folder gone.
I connect via USB with my PC and create a new folder. After reboot newly created folder gone.
I create a new folder via Open Camera. After reboot gone.
Changed 3 other SD cards. Same behavior.
I installed SDFix app which mentioned in this forum says that my SD card already writable, there for no need this app.
I made a clean install with help of this wiki page (Thank you @rootboi So easy ;D )
Now, Fresh Open OS. No Gapps. No Exposed. Still same problem. Created folders gone after reboot.
Any ideas? Help?