UPDATE! - With the release of SketchUp 2015 we now support Yosemite, but only on that version of SketchUp. If your Maintenance and Support Plan is currently active then you should have already been emailed your new license information. At this time there aren’t any plans to update older versions of SketchUp for this new operating system. If you’re using a previous version of SketchUp or your Maintenance and Support Plan has lapsed then you can always upgrade in our online store at http://www.sketchup.com/upgrade
tl;dr - Don’t upgrade yet. If you already did, you should “undo” it.
Apple released a new version of OS X this week, OS X 10.10 aka Yosemite which brings many new features to the operating system. Unfortunately it introduces some structural changes which have impacted SketchUp 2014 and likely most previous versions. Because of this change in the operating system we are advising against upgrading, even though it’s free.
If you choose to upgrade to Yosemite, note that we won’t be able to offer solutions for any of the issues that arise which is to say that it’s an Unsupported Environment.
If you haven’t upgraded yet and you use SketchUp regularly, our recommendation is to wait a while before upgrading.
If you have already upgraded then there are two possible options; use Time Machine to roll back to Mavericks or erase and reinstall Mavericks. Below are Apple’s articles on each option:
Note that this isn’t us writing off the new version of OS X with a claim that we won’t ever support it, it’s just advice for those considering upgrading to this new operating system.
It is this author’s opinion that any operating system is going to launch with some quirks and that it is generally advisable to wait for at least the cycle of one maintenance release or patch before upgrading if your system is mission critical and you can’t afford the down time while waiting for these glitches to be addressed.