With DTPO 2.8.1 on OS X 10.10, the Print PDF to DEVONthink Pro Office import dialog tag tokens are now nearly invisible. See attached image. If the tag token is selected, it is visible; but otherwise it is very dark against the dark background. This makes it difficult to keep track of what tags have been applied when importing in this way.
Thanks for the bug report, the next maintenance release will optimize the appearance of HUD panels for Yosemite.