when you patch generic dimmers it easily happens that the fixtures will have the same name, this "confuses" v5,
steps to reproduce:
. patch no.2 dimmers
. delete dimmer #1
. patch other 2 dimmers
. group list now shows a bad selection and it's prone to bad actions like renaming the wrong fixture etc. etc.
as you can see from the picture,
group list shows dimmer address @2 selected, in 2D view I've selected the new added dimmer, dmx @4.