I used to like to put a compressor on the "combo" in the older versions of BIAB. The old menu looks different to me now, and I can't access the plugins window anymore. All I see is a drop down list. Am I missing something, here? If anyone knows how to do this , or access the old style dialog box, it would be greatly appreciated.

Have you tried making sure "Master" is displayed in the mixer; you should be able to load plugins there that affect the overall mix.

Yes, it could be hidden