Help ext4 formatted sd card not mounting lollipop 5.0

[betelgeuse2112]

I just installed a 5.0 ROM from having been on 5.1.1 stock and discovered the ext4 formatted sdcard is not being mounted. It seems ext4 may not be natively supported in 5.0.

Is there an app I can install that can fix this? I found various "sd card fixer" apps but none of them worked.

Any help would be greatly appreciated, thanks.