My ExtSDCard has begun to act funny over the past few days. I have downloaded and used a few file managers in the past, and my current favorite is ES File Manager. However, over the past few days, I have been unsuccessful in using it to copy anything to the ExtSDCard, always receiving a "Failed to copy" message. I tried the same with Ghost Commander, which is clearer in its failed operation message, yielding the "EACCES (Permission denied)" error message.
To try to correct the error myself, I moved everything I needed to retain to Internal Storage, and reformatted the card. It was virtually empty - barebones. Upon trying to move things back, it did not work again with either File Manager, however, the most simplistic file manager MyFiles did the operation without problems. So now my files are back on the ExtSDCard, but I'm concerned that my favorite file manager ES File Manager is now useless, as is Ghost Commander, too. MyFiles as a file management system really lacks sophistication.
I have uninstalled, and re-installed ES and Ghost Commander without recovering their former functionality. I have rebooted the tablet a number of times, thinking the disk was locked through some system lock that would reset. No luck. I have proved that Dropbox can export a file directly to a location the card, too, so writing is possible, just not with these tools.
I am not looking for alternative file manager suggestions. Anybody have any ideas what is causing well-distributed file managers to lose functionality like this? If it makes any difference, I'm not rooted. It's a Galaxy Tab, which just received an update OTA to 4.4.2 a couple weeks ago. The file managers retained their functionality until just a couple days ago; I don't think the upgrade has anything to do with it.