Ha, wait a moment - I've just seen that I'm pointing to an older version of Vienna Imperial in VE Pro - I'll give it another try, maybe I can reproduce the problem.
/Dietz - Vienna Symphonic Library
194,333 users have contributed to 42,916 threads and 257,955 posts.
In the past 24 hours, we have 2 new thread(s), 14 new post(s) and 83 new user(s).
It looks like a strange incompatibilty issue between the older version of Vienna Imperial (the one which was used for creating the Schubertsaal Venue Preset you were using in your video) and the most recent version.
Other presets seem to be unaffected - I just loaded the Teldex-based Vienna Imperial Venue Presets, and they load without a hitch. Does this work on your system, too?
UPDATE : I've revised the affected Venu Presets - the updated ZIP (containing the whole collection) will be online later today. I'll let you know.
Apart from that, our software engineers are already looking for the reason why a missing virtual instrument plugin can crash another one that gets loaded afterwards. Over and all, you ran into a rare combination of variables that went unnoticed before. Thanks for reporting, and sorry for the inconvenience!