SD Card Write Access from 3rd party apps??

Has anyone been able to get write access to the SD card from 3rd party apps like FX File Manager? When I try to enable write support it loads the dialog to select to root of the sd card, I do that, and it goes right back to the start of the process. This is the 2nd app that does this. I have the SD card encrypted and am running on the original firmware.

Cheers :)