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TH-1682: AP problem: Custom Metadata drop down boxes do not work in single item upload pane - Windows only
TH-1684: Minor Arrowing issue; delete while enlarged jumps one image to the right
TH-1688: Metadata: the value "1" vanishes from drop down boxes
TH-1689: Overenthusiastic arrowing - up/down arrows cause last used drop down box to appear
TH-1698: bulk update without metadata: all files are uploaded as "untitled" without thumbnails
TH-1536: support more audio/video types
Notes: group web scripts need to be updated