Also in playback of the montage through the external plugin. This does not happen with software mastering limiter plugin. However, software plugin sounds not even close to the Manley Vari Mu Mastering unit.
What is your audio card buffer size? You should certain not have it under 512 samples, in your ASIO control panel (I am not speaking about the number of buffers).
The card latency was set to 256 samples. I increased it to 512 samples.
I checked the result of the DPP burn at 256 samples and 64 buffer size. No drop outs. So that is good news.
Just to be safe, I decided to burn the DPP to an external 7200 rpm Firewire drive. I am thinking perhaps reading and burning to the laptop internal drive simultaneously is the cause. So I will check this result later.