Hi,
I know, it’s been a while, but to conclude this entry:
After release of Xena drivers 3.5 & after changing the Xena LH into a different workstation (Dell Precision 690 – good product) speeded dow/up SD material plays fine now without rendering (on the desktop preview).
I think the problem was a mixture of early Xena 64bit drivers, RAM problems and driver problem for 64bit in general. After all Microsoft updates helped also.
Anyhow, thx AJA support for answering;)
Normann