Unfortunately, this isn’t a simple case of WebGL 1.0 vs 2.0- it also depends on how your graphics driver, operating system and web browser implement those standards. I think the trouble folks are reporting is evidence that there’s a great deal of diversity out in the wide world of SketchUp users. In other words, it isn’t a simple matter of ‘reverting’ to WebGL 1.0…
We’re compiling data, working on releasing a fix to address the most challenging cases as soon as we can. It is almost always the case that updating your OS, Browser and graphics driver to the ‘latest’ version is the best possible way to fix the issue… but there may be a root cause that won’t be fixed with simple updates.
Linux offers a special set of challenges, as it is still, unfortunately, the case that things like display drivers aren’t always given as much attention by manufacturers as they might be given for Windows.