I recently took an LHe out of my old G5 running FCP suite 2 and installed it in a brand new system with no problem – see my signature below. Not a great deal of help I know but it proves LHe does work with FCP7!
What is your system configuration?
Have you installed the latest drivers for the card?
Have you tried trashing prefs?
How exactly did you do the upgrade?
Have you tried opening the capture window with no deck connected?
What flavour of Beta deck are you using?
Are you controlling the deck via a Fire wire or RS422 lead?
I guess we need a little more info about your setup…
Scarab
Mac Pro Octo 2.26 16Gb Ram (Purchased Sept ’09)
SL 10.1.6
ATI 4870
Kona LHe
640GB Startup
1TB Internal Storage
2TB SCSI Raid Storage
Tangent Wave
FCP Suite 3 (FCP 7.0, Color 1.5)