I have installed several balun/Cat5e setups in the past using a wide range of cameras and conditions with no trouble. My only problem is I never paid attention to the brand of cat5 I was using.
I just purchased 2 boxes of TWDOK cat5e blue network cable and pulled 2 camera lines not more than 120'. No bends, kinks or splicing. (though I have coupled cat5 with cat5e jacks and patch cables before with no problem)
I also pulled another line with these 2 using a left over box of another brand of cat5e about 60'.
Identical cameras and baluns, the 2 lines from the TWDOK showed no image. Voltage tested at 12.27 from my 10a 12v ps. but the cameras would not power up (built in LEDs and test monitor). When powering the cameras locally, no video at other end. Tested baluns with patch cables OK. Toned out cat5 connections and tested with cat5 cable tester, all OK.
Even tried crimp ends, bare wire ends and 2 different types of baluns and cat5 jacks, and no go from these 2 runs. The box says its cat5e, the cable is printed with cat5e but I wonder if its some cheasy knock off stuff.
Anyone else run into anything like this?