Only noticed this since last update to 2015.10 - when in Develop module, press F for full-screen view of current image.
Press F to toggle back to Develop, then arrow to next or previous image - Loupe Info at top left doesn't display Info 1 or Info 2 details, only filename.
Pressing I to toggle the Loupe Info display cycles through again.
Have restarted LR & system - can reproduce issue.