Undefined tags

I'm running syncpreview (version 1.5a1 r4037) on a Mac. With the last update (which also coincided with me adding a webDAV sync, all of my tags have become "undefined." That is the only tag that appears, and it appears over and over again. Is there any way to restore my old tags?
  • 1) Just to be safe, turn off auto-syncing, and don't sync manually.

    2) Try disabling all other Firefox extensions.

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