PC
Lorwyn Eclipsed Traditional Draft
Opening hand a weird glitch where a card was missing in the middle.... thought it would resolve if I just kept the hand and continued the game... but yeah it was weird cause it kept the 6 regular cards and one invisible card ... it didn't draw a 7th or reveal the invisible/missing card.
As I was looking to report the bug, I actually timed out my first turn... and hence noticed that because I had drawn a card for turn I had to discard down to 7... so that invisible/missing card still counted for my hand size.

Interesting bug... sad that it impacted my match listing in a limited game with currency on the line... but what are you gonna do ... apart from make a unique bug report