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CC uses android's Storage Access Framework (SAF) to write the SD card because this is what Android > Kitkat requires. The SAF requires that an app (CC) ask for a long-lasting "permission" to read or write a folder. Unfortunately, from time to time Android forgets about these permissions, meaning CC can no longer write the folder. The usual causes are OS upgrades and device resets, but I am sure that there are random cases where is just happens.
When a user resets a folder to the same folder, CC asked again for permissions on that folder. The fact that this process fixed the problem for you indicates that the original permissions had been lost. Our apologies, but I can't find any way to avoid this happening. Fortunately it is rare, but that doesn't help when it happens to you.
Did the Fire have an OS upgrade?
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