Topic: hdspe-card, osx 14.6, driver version

hi all,

upgraded my very old mac-pro to a old mac-pro and had the joy of trying which driver works

installed driver 4.13 for my (30)-firmware card
midi-port 2 was unavailable

flashed to firmware 33, installed 4.21
all midi-ports available, but MADI-dropouts like every 2 seconds (frequent)

had to roll back to 4.13
now everything seems to work

is this a known issue ?

thx in advance