Issue with drag-to-tag-feature in FF4b8

kithairon
Noticed the last two days that I can no longer drop a freshly created item onto an existing tag.(Tag can still be added ok manually via tag-tab in righthand panel.) The tag used to be 'responsive' earlier when an item was dragged over it!this currently doesn't happen.
I'm on OSX (10.6.5) and the lastest beta of FF4!changing general.useragent.locale to en-US has made no difference.Not a big thing, but miss this elegant function.
kithairon
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