Click at beginning of Mixdown - VST Guitar Amp?

Hi there,

I am just completing an album for my son. I am at the final mixdown stage and noticed some tracks have a click right at the beginning of the mix.

By a process of elimination I am wondering if this is something to do with the VST Guitar Amp plugin?

I am using Cubase Elements 10. I am mixing down to 16 bit Wavs. I have tried using the “Real Time Export” option, but this doesn’t seem to help.

Any tips or ideas much appreciated.