You should always restart SketchUp after installing any complex Extension - particularly those which use a supporting ‘Lib’…
If it’s still a mess after a restart, try reinstalling the Lib from its RBZ again.
Are you still using a MAC as in your Profile details?
These are usually relatively foolproof, however try reinstalling SketchUp after you ensure that SketchUp is closed - a half-baked installation can happen otherwise !
On a PC incorrectly installing SketchUp itself can cause weird permission problems.
It must be installed by selecting the PC version’s installer exe file and in the right-click context-menu choosing “Run as administrator” - if it’s already installed choose “Repair” when prompted.
However with Fredo’s Lib you can create a set of PC preference files with bad permissions, which then continue even after SketchUp has be fixed !
In this case, Close SketchUp.
Find your Local folder
and find its subfolder named
delete it and its contents.
It is hidden by default, but it should be directly accessible when you use that
%...% path in a Windows Explorer window…
Note that the equivalent on a MAC is…
and its subfolder is named:
with an initial . to make it hidden…
BUT deleting that would really be a last resort, because it is very unlikely to have issues…