Hey fellas, sorry I haven't posted sooner, we're down a man in tech support so we're struggling to keep caught up. It looks like were looking at a few different problems here.
FxPatrice and anyone with Sidewinder connection issues: Your problem is because of a small glitch in our software. The way it shows itself is both connection status boxes will be green, but you only have the About tab and if you try to click anything you get the "No controller or invalid controller error". There was a line of code that did not allow newer versions of the Castle Link to recognize the Sidewinder with V1.15 firmware; every other product will connect without any problems.
Download the latest version of the Castle Link (V3.13), our engineers have fixed the coding glitch and it will connect without any problems. You can download the latest version
here.
Magman: The problem here was after installing the latest version of the Castle Link, when you open the Link it still thinks it's an older version (You can check be clicking Help > About). The only way to fix this is to uninstall the program, and reinstall it to a different directory on the computer. This problem is a little different because it won't allow any controller with newer firmware to connect, even though you have the latest version installed. The other problem was only with sidewinders with a specific firmware version (V1.15).
FreakyCrawler: Is anything running hot? Cogging usually occurs when something is heating up abnormally. It could also be caused by a bad or loosed connection between the speed control and motor. If there is a bad connector or solder joint, it will cause the motor to two phase, where it just stutters and kicks back and forth.
Hope this helps clear things up a bit, but if you continue to have problems or have any other questions, just let me know and I'll do my best to help.
Thomas Porfert
Castle Tech Support