Upgrade StorageWith Word in full screen-mode
The Zotero–Word connection works poorly when Word is in full screen-mode under OS X Mavericks. I use two screens, having Zotero stand-alone as a window on one screen, and Word full-screen on the other. When adding a new citation, I am taken out of Word's virtual screen to my first virtual screen, where the red-bordered bar appears, but the insertion point is placed in the search field in Zotero stand-alone on my other screen. If I keep Word in windowed mode, it works as expected, so the bug seems to be linked to the full-screen mode.
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