When a new tab opens in the background, the control bar, tab, and bookmark bars appear completely transparent, making them unusable. This only occurs when the page loads in the background; if Orion is set to switch to new tabs as they open, or if you reload the tab, the page loads correctly.

Expected control bar, tab, and bookmark to remain solid, as they do when an active tab loads.
0.99.137-beta
Tahoe (26)