Hi there, hope there is someone that can help!
My problem is that when I rotate/pan/zoom (anything that changes the viewport) I am no longer able to Undo previous commands.
I’ve just updated 2015 to the latest version and that hasn’t helped much . I’ve also triple checked the preferences and searched the web for help… also reinstalled SU.
Has anyone experience with this, and knows of a workaround or a setting I have overseen? All help appreciated!
regards
William
Any chance you have extensions installed? If you do, maybe try temporarily disable them to see if that makes a difference.
Hey TT
Yes I did, and you suggestion worked!
It was Lux Render that was the cause. (knock on wood) I had to manually remove it in the \AppData\Roaming\SketchUp\SketchUp 2015\SketchUp\Plugins folder, but know I can pan/rotate and zoom, as well as Undo!
Thanks for the help 
I would recommend you contact support for that extension and inform them about the issue. Sounds like they are making model changes during observer events - which has this negative side-effect of flooding the undo stack.
You can tell them to contact us/me if they are unsure on how to solve this.
Hadn’t considered that. Will do.
thanks again for the input.
William