Cannot Copy - TWRP External SD Mounted topic

I'm receiving the attached error when attempting to copy files to either the internal or external sd storage when in TWRP. I am able to copy to the internal SD when the phone is booted. It doesn't seem to matter what type of file I attempt to copy, nor does the size of the file. The device also no longer shows up when trying to use ADB.

I'm running TWRP 2.8.4.0, the phone is rooted, usb debugging is enabled.

I've tried two separate USB cables, two separate computers, same result. Both computers running windows 7 x64. I've tried googling the problem, but I haven't been able to really find any good solutions.

Anyone have any ideas?

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