3 questions on Bridge today

3 problems with Bridge today:

1   A few, not many but few thumbnails not showing previews:   I opened in PS, still same .

2  Some have white label.  Bridge often mangles color labels over time and replaced with a generic white, fine, but wont go away even when I select label, no label. how get rid of the white label?

3.  no screenshot need but , most annoying:  Tifs for some reason wont take label, no problem jpegs, dngs, but tifs just wont take a label, worse, when click keypad to add label then jumps to top of the thumbnails. thanks!