[Shoop_NL]

Another thought on this:
21:10:25 T:139731367085824 NOTICE: X10-Lights: Switch King, The OFF Event Failed
21:10:25 T:139731367085824 NOTICE: X10-Lights: Event Device ID = 06
21:10:25 T:139731367085824 NOTICE: X10-Lights: Event Action = OFF
21:10:25 T:139731367085824 NOTICE: X10-Lights: Event Value = 50
21:10:25 T:139731367085824 NOTICE: X10-Lights: Event Free CMD = False
21:10:25 T:139731367085824 NOTICE: X10-Lights: Event ROOM = 0
21:10:25 T:139731367085824 NOTICE: X10-Lights: *************************************************

Why does it say Event Value = 50? Is it dim level? Because the switches I use are not dimable, they're on/off. But I didn't choose a dim level, I chose on/off. Might this be the problem?

Hi Exile82,
The event value 50 is ignored (not used) in the combined command of the URL message if you use the Off event.
You can also see that in your lag files the you have send before.
For the other issue's you describe, I do not have a solution for that.
If you cut the URL from the log file directy into the browser it seems to work.
The only thing I can think of is security.
Is it possible to switch of security in the switch king and also in the X10 - Lights add-on and then test it again?