Yellow Warning signs in Layout

Wondering if you can help me with an issue I am currently getting with my SketchUp and layout. I am getting the yellow warning sign on the layout pages – see below. This is occurring on most of the windows on Layout now and I have tried a few different models but it is still happening. I am not aware of doing anything different to what I have done in the past.

The only way to get rid of it is to double click on the window, but every time I update anything it comes back……………. Can you help?

Forum search

Many thanks. That worked