Sorry for not responding earlier but it's difficult to tell from what you've provided. For assistance with coding issues on the forum we require following the guidelines for
posting Vizard code. Try reducing your code to the very minimum that reproduces the issue. Since the zspace example included with Vizard runs fine, you maybe to reproduce the issue using monitor/keyboard. In that case others can run and reproduce it easily as well. Also, take a look at the
render stats while you're running your program. That can help with troubleshooting performance issues.