I had the same issue. On Mac 10.6.8, I tried and uninstalled and reinstalled both DashBoard 2.0.2 and 2.0.3 by the standard procedure and even fix permission in the middle of my un/reinstalling. After that I hook it up by firewire800 which recognized and mounted my DroboPro on desktop like usual. Safely shutdown the DroboPro, unplug the FW800, plug the iSCSI in and turn on DroboPro back switch and it boots up but DashBoard 2.0.2 and 2.0.3 was not able see or mount it.
On 1.8.4, the DashBoard worked fine with DroboPro connected to iSCSI. And I have not changed any setting trying to upgrade to 2.0.2 or 2.0.3.
So, in the end, I gave up on DashBoard 2.0.X because I believe they are crap and DR need some talented folks fixing their DashBoard iSCSI initiator. I have since switched to using the GlobalSAN iSCSI initiator and it was night and day difference. It never randomly disconnects my DroboPro and never fails to see and mount my DroboPro.
However, I will have to hook up the DroboPro via USB/FW800 to change settings. But I don’t change the settings after I’ve set it up and I rather prefer a solid connection than having to go though the uninstall/install/hook up USB/unplug/hook up iSCSI/try again process almost everytime I upgrade to a new DashBoard version.
Now, just need to find out if GlobalSAN will support OSX Lion…