Humm/buzz on rendered export.

[MunkeyStu]

Hi All,
If I change any settings in the render dialogue box just prior to rendering it adds a humm/buzz on the finished product. If I don’t change anything in the render dialogue box then it renders okay.
This means if I want to make a change, I have make the change and render it, then close & reopen Waveform and re-render it with the settings previously changed to.
Changing any settings in the dialogue box means exactly that. If I touch anything in the dialogue box it does this.
I’m using Waveform Pro 11.5 although it’s done this on previous version 11.1 Free & Pro.
Your help would be much appreciated.
Cheers
Stu