I had picked up some LED pixel strips from ledlightinghut and can get them to work thru my E681 from Sandevices during the test patterns they have and Lightshow Pro recognizes and controls them via some transitions, but they flicker whenever Lightshow Pro trys to control them either thru the playback of a transition or even the testing controller screen.
There's lots of variables that could cause the flicker.
Based on your link to ledlightinghut, you're using WS2801 type pixels.
A few questions:
1. How many pixels are you running?
2. What size power supply and wires are you running from PS to E681 and between E681 and pixels?
3. How did you define the pixels to the E681? Pixel type? # of pixels? # of strings?
4. How did you define the controller in LSP and what does the output configuration look like?
Screen captures of your E681 config screen and your LSP output configuration will go a long ways in helping to answer some of these questions.