Problems with the Plugin MacDSP SA-3 Spectral Processor

The first time I try and use this plugin I get the message…

At this insertion point, the plug-in cannot accept the number of input channels.

If I close the plugin and reopen it the warning does not appear. This is in the master or edit window not the Montage window.

I am running on Windows 10, an I5 Processor, three SSD drives. Using the most recent update of WL 12 and I have the same problem on WL 11.

Suggestions or how to fix???

Apparently you found it: If I close the plugin and reopen it the warning does not appear