Currently the issue appears to turn out as a system specific problem.
Most of the crashes related to EuCon are caused by calls to the Apple AppKit and / or WebKit (also in this case).
So, to bring probably some intermediate relief in this case, here is a list of things to check / do:
-- Make sure no web-based applications are running when using Nuendo
-- Possibly disable toolbars from the browser(s)
-- Perform Repair Disk Permissions
-- Un-install and re-install the EuCon adapter
The behaviour has been further improved in the latest Cubase Update 7.5.20 .
However Nuendo users will have to wait some more...
in the meanwhile, it is worth a double-check.
I see you're using 10.8 as well, I wonder if Mavericks would change anything.
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