I'm noticing several links are bringing up "Resource Unavailable" errors, under certain circumstances. Hover is unaffected, so the link must be good, but Logos 4 isn't doing the right thing with it.
For example, most links to the Word Biblical Commentary series show up as "Resource Unavailable" when you click on them from Power Lookup.
Equally, links to TDNT from New Bible Dictionary don't work if you right-click and open in a tab, but do work if you left-click.