Thanks for the replies, sorry I didn’t provide more info:
I am using the SU 2015 Pro version 15.3.329 (latest version)
MacOS 10.2.2 on a MacBookPro, 16GB Ram.
No insult taken. Definitely selected, and I can select many items - the items are highlighted in the model as being selected, and if a component/group is selected I can then double click and edit. I have noticed that the Entity Info dialog is slow to respond at times, too.
I have not tried disabling the plugins yet, good suggestion. I have a lot, but all come from the Warehouse (and I make a habit of updating them). They are indispensable to me, but I’ll check that.
Other important note: the model I have seen it on most, but not exclusively, is big - about 150MB, with more than 3.6 million faces, 26,000 component instances. It may simply be that the model size causes SU to delay showing what is selected. Still, it doesn’t happen all the time, and once it starts I can’t stop it short of resetting the workspace or quitting and restarting. I never saw this in 2014 (or any version since v8, when SU got to be ‘good enough’ to work with big models.
I was interested to see if anyone else had this problem. I know the Entity Info panel on the initial Mac 2015 release could get messed up, it seems that there may still be a bug in the code.