Hi Graham,
I was using this functionality over VBScript just last week and didn't notice any issues. Could you provide some additional information, like what processor you're targeting, whether simulator or hardware (and, if hardware, what emulator). Ideally, if you could share your script and an example project that would be beneficial.
If you prefer to do so through private support, please use the link below, and include a link to this thread.
Regards,
Craig.