Ardour 2.8.7 has been released and can be downloaded now. This is a bug fix release almost exclusively focused on OS X. These fixes enable correct operation and use of several "families" of AU plugins, including those from Stillwell/Schwa. If you've had issues with some AU's even after the 2.8.5 fixes, this is worth trying. Linux users who do not use the Czech translation have little reason to upgrade at this time.
Smarter decision making when deciding which in/out configuration to choose when handling an AU plugin that has several.
When exporting/bouncing/consolidating, tell AU plugins the new processing blocksize so they will actually run during the process. Yes, that means what you think it means.
Remove use of std::locale() which is utterly and completely broken on OS X, and causes a program to crash if used with any actual national locale.
Don't reconfigure I/O of AU plugins when they already have the correct I/O configuration
Updated Czech translation from Pavel Frichttp://ardour.org/download