Situation: You have multiple partitions or hard drives set up on your Mac. After booting into a different partition or drive you're missing your extensions and plugins.When installing SketchUp on a Mac with multiple drives or partitions, we always recommend installing on your root volume. However this can cause problems when booting into another partition. To resolve this problem we suggest one of these two options:

Classic License users may see an error message during an unsuccessful attempt to access 3D Warehouse or Extension Warehouse while using SketchUp for Desktop. This occurs when SketchUp cannot verify your Trimble ID credentials.Common CausesCommon causes for an authentication error to appear include:An expired login session (also known as a session timeout)Network issuesBrowser issuesPossible solutionsTo resolve this issue, take a look at the following possible solutions.

To work around this issue, press Ctrl+F7. If you're using a Mac laptop, press Ctrl+Fn+F7.Pressing Ctrl+F7 will disable Full Keyboard Access. If the shortcut doesn't work, go to System Preferences > Keyboard > Keyboard Shortcuts. Select Text boxes and lists only under Full Keyboard Access.