One problem is that category 1 HDMI cables are only specified to support 1080i signals. They aren't guaranteed to support 1080p60, and a number of cables (espec

One problem is that category 1 HDMI cables are only specified to support 1080i signals. They aren't guaranteed to support 1080p60, and a number of cables (especially no-name chinese cables or longer runs) are only tested to this spec, as category 2 has a huge leap in required bandwidth (all of HDMI 2.0's new stuff works with category 2 cables.) So attempting to send 1080p over a category 1 cable isn't uncommon, and it often "works" with occasional dropouts.