iMac Pro 10.13.3 beta 4 won't mount drives

Just received my iMac Pro on Thurday. All USB external drives mounted with 10.13.2 but after installing 10.13.3 beta 4 two of the drives would no longer mount. Reverted to 10.13.2 and the drives mounted again.


Any thoughts?

Replies

10.13.3 beta 5 same problem.