I just noticed a strange behavior with the SketchUp Pro 2016 (Mac) Select tool’s triple-click feature when applied to a particular component: it is only selecting the targeted surface and its edges, rather than selecting all connected. Triple-Click when editing any other component in the file behaves OK. If I progressively delete various random faces and edges from the problematic component, eventually triple-click on a remaining portion will select all of it. Similarly, if I delete sufficient other components in the model then triple-click will begin working to select all connected edges and faces of the particular solid component. If I Right-Click on a surface and choose Select > All Connected, it works OK (selecting all connected edges and faces).
[Edited to add: SketchUp Pro 2017 and 2018 behave OK on this particular component.]
I don’t recall seeing this before, and I’m concerned there is corruption in the model file. I’ve done a Save-As and the resulting copy of the SKP file behaves the same as the original (that is, problems triple-clicking on this one particular component). I have older copies that I had saved every day or two between editing sessions, and if I go back a couple of such generations, then the problematic component behaves OK. In the interim generations I have been working on another component.
The file is about 29MB; I’ve put a copy on DropBox here. I’m hoping someone might have insight into what is happening.
When you open the file, the component in question is highlighted here:
The highlighted component is within an outer-level component. To try reproducing the behavior, double-click on the component to open the parent (outermost-level) component, named “HGA DCS Assy”. Then double-click on the highlighted component (named “HGA DCS Drive Head Center Frame”) again to open it. Finally, try triple-clicking on some surface of the highlighted component.
The other components in the file seem to behave OK with triple-click, selecting all connected faces and edges. FYI, the components that you see in the screen-shot are scaled up 100X from normal. There is a smaller size copy of this component and various other bits and pieces off-screen. The two scenes relocate the camera to a suitable location for the small and the large copies of the components.