Hello,
I use the driver 3.085 and now the 3.21 driver on win7 64 sp1 (MB Asus P6X58D premium) and i didn't have any issue with the loading tray, strange... I don't have any anti virus or firwall, my DAW is not connected on the net, only few minutes sometimes just for update.
Before i had installed the 3.085 driver, it was the fireface UC driver which was installed before on my system. I desintalled the fireface uc driver before installing the raydat 3.085 driver. I don't know if it's important.
Actually the only trouble i have is with sequencer, (reaper 3.75, alphav4.xx, samplitude pro 11.2) when i open or close mixing view i have a sound interrupt (the time it need to open or close the view), not sure it come from the driver. Nothing else, the multi client features with 3.21 work very good here...
My Raydat is connected to a Zed R16 board, and fireface uc two. My main windows ouput sound goes out trough my fireFace ( the analogue output of my fireface goes in stereo intput on my board, in 44 Khz), and all my Asio input from my Zed board are always in 48Khz. I could have reaper (or samplitude ) open project in 48Khz and i could listen my render with winamp or windows media player in 44khz at the same time (very handy).