2 Iron

Re: symdev show and powermt display dev=

You're not looking at the same devices:

Symdev show is for FA 7bB & 10bB (or 7b:1 and 10b:1 if you prefer)

Powermt display is for 7aB & 10aB (ot 7a:1 and 10a:1)

Anyway - as suggested also perform a "symcfg discover" to re-discover the Symm & the host's visible paths. Symdev show works from a cached copy of the bin in /var/symapi/db, which will be wrong if you've just masked new devices.