from mzscript docs:
"
will show the current time in a message box."
but if i execute this, i see in msgbox '%[hour]:%[minute]:%[second]'.

What can cause it?

Using one version of the module, but reading another version's docs, most likely.
From 0.9_beta12 docs:

yes.. %{} is now the default syntax i not read this.
thnx!