Default [solved] Flashed CM11 SD Card (external) not accessible anymore

Hey I just Flashed the most recent nightly CM11. But now my (external) SD Card is not seen anywhere.
What I tried so far:
- clear caches (CWM)
- reflashed cm11
- format sd card in windows (fat32)
- format sd card in windows (ext4)
- format sd card in CWM (failed)
- mount sd card in CWM (failed)

sd card is working in card reader (both win/linux) and worked before in stock ROM, so I assume it is not broken and generally compatible to the phone.

any suggestions what else to try?