Try this first and if it is not the issue, then please report back via support. Your request there has been updated as well. Please make sure to check your Spam/Promotion folder for SA support emails.
It could be that there's a Mid or Key assignment on the main output level fader of KICK 2 and then each time you press play in Studio One or the space bar on your keyboard, then then the output resets to zero and thus you can't here anything
Try right-clicking the parameter that is resetting to zero and check to see if there is a MIDI CC parameter assigned - and then remove it.