Maybe it's obvious to some of you, but I had some weird behavior with the Valhalla VintageVerb plugin. The reverb tail was cutoff by the sound it was applied to. Toggling the "Auto Suspend Plugin When Silent" to off, fixed this.
I read that the devs like to now these settings, so here you go.
Settings for plugin options that seem to work for me are:
[V] Use static buffers
[ ] Auto suspend plugin when silent
[V] Can run in multiple processor environments.