I installed the control on my windows domino server 8.5.3 and it was working !!!
So it seems not to be a 8.5.3 issue. My further investigation was, that I removed the XPages Extension Library and our own OSGI Plugins but no success. It ist still not running on our servers, which are based on CentosOS. Right now, I don't have an idea, where to look for a solution. It's a pitty, because the control itself is so nice.
Any ideas ? Help is appreciated :-)