Hosts' weirdnesses - let's list them!

Many hosts do not behave as expected with the plugins. I’m speaking about bugs/weird things that are not related to juce, but to the hosts.
I thought we could maybe share our observations of those by listing them in a single thread.

It would allow us to avoid spending time in unfruitful debug sessions, to be prepared to implement workarounds, etc.
What do you think about it?

Here are two related to reaper to begin :

- VST : REAPER won’t check if your parameters are automable or not. So it will display them and allow automation even if you return false in isParameterAutomatable()

- channel names : REAPER expects the same channel names reported for channel pairs (reported by Razer here : http://juce.com/viewtopic.php?f=8&t=9406 )