HDMI cable is delicate (and expensive), which is why I'm using the BVHD-10 to extend HDMI over CAT-6/5. Do I need to be cautious in how I run my CAT-6/5?
In a word, yes. Sending HDMI, particularly with HDCP, involves a lot of different things happening at very high speed. Transmission or wiring errors often will result in no picture at all. In component video, you can have problems and still get a picture ranging from pretty good to bad. With HDMI, problems often mean no picture.<br />
Error or losses in the signal chain accumulate. If that last statement is not scary enough, losses may be tolerated on some content material more than others. Bottom line, don't cut corners. Some past wiring practices will get you into trouble. Be leery of jobs where someone else ran the wiring and pay close attention to the advice below:

-Use short (0.5 meter) lengths for your HDMI interconnecting cables
-Use Category-6 (or better) network cable (attainable distances are shorter with CAT-5)
-Use CAT-6 RJ-45 push through connectors and use the associated strain relief at the connector
-Make sure the two wires in each pair are terminated to exactly the same length
-Siamese CAT-6 is a good choice but not required
-Keep the HDMI interconnect cable to the Driver and from the Receiver as short as feasible
-Use high quality HDMI interconnect cables and, if possible, use 340 MHz (Category 2) HDMI interconnect cables
-Treat all cable in a kind and gentle fashion using large bend radiuses (minimum 1.25 inches)
-Follow the same practises as when wiring for a Gigbit Ethernet network