Hi Klaus and welcome to the forum!
I can not reproduce that, it works as expected for me (I have just checked with b314 and 2016.05).
But please check that you are using it correctly: there must be either "Strip" + "FX" combination or "ACT" prior using Open of Focus functions (to specify what you want to focus or open). Next/Previous are working different way, they do not need prior plug-in selection. That all is described in the documentation, but may be not sufficiently.
Note that the selection is persistent, for example in case you turn some knob with "ACT R1" + "Set value" combination, "ACT R1" is remembered and so "Open" can use it.
If you can publish your preset (not sure you can attach it in this board, but you can attach it to posts in the "Discussions" board for sure), I can have a look. If there is a bug on my side,
I most probably can reproduce it with your preset. Otherwise I can demonstrate how to fix the preset.
Regards,
Alexey.