Normally it works fine.. When nothing displays this probably has to do something with the module position? Are you sure that it is correct? Does custom html show up? Which module are you trying to use?
Hmm not sure, but it's probably a Matukio issue (or an combination).. One library is not loaded correctly.. Going to release Matukio 6.0.2 in the next couple of hours, if that not fixes it we need to dig deeper.
I just dealt with the theme developer, they did not understand why it was not working either. I'll keep an eye on 6.0.2 and try that when it's available. Thank you for looking. I'll keep you posted as to my progress.