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The same story.
Solved with manual “downgrade” to 1.1.7 files in following places:
root_folder/skin/adminhtml/default/default/media/*.swf (all the swf files)
can not localize the buttons (values stands in english, need other languages)
If you make upgrade, please, check all twice! So many production servers, so many trouble.
I fixed this problem by having my webhost disable “extra web security” - it was actually a setting in my Dreamhost domain utilities. It seems that the mod_security was giving me a problem. Now I’m good to go using Flash 9 ("if it aint broke, dont fix it!")