I have upgraded to New Beta version SMath Studio 0.98.6354 (Win7)
User-defined functions and variables do not work well in auto-completion.
This happens when the variable name has a lower index (eg A.x). The variable is in the list but is not selected automatically.
There are some difficulties even for internal functions with auto completion. For example, the g.e unit of measurement is not in self-completion mode (I think it is because of "." )
sergio