Have sketchup8 running on lion 10.7.2 and cannot get plugins, rubies to show up. have done identical install on Leopard system with some success but Lion system is not working at all. Anybody having similar problems?

Have reinstalled Sketchup 8 and Latest Lion update 10.7.2. In trying to install rb files cannot find:Mac HD/ Library/Application support/ Sketchup8.
Have uninstalled and reinstalled a couple of times..... Help.

please tell me what is happening when i get this message on starting sketchup...

.Message from 000_AdditionalPluginFolders

5 ERROR(S): The following plugins had errors and may not be fully loaded:

PLUGIN: animation.rb
FOLDER: /Library/Application Support/Google SketchUp 8/SketchUp/Plugins
ERROR: undefined method `GetString' for nil:NilClass

PLUGIN: attributes.rb
FOLDER: /Library/Application Support/Google SketchUp 8/SketchUp/Plugins
ERROR: undefined method `GetString' for nil:NilClass

PLUGIN: box.rb
FOLDER: /Library/Application Support/Google SketchUp 8/SketchUp/Plugins
ERROR: undefined method `GetString' for nil:NilClass

PLUGIN: examplescripts.rb
FOLDER: /Library/Application Support/Google SketchUp 8/SketchUp/Plugins
ERROR: no such file to load -- examples/box.rb

PLUGIN: ocean.rb
FOLDER: /Library/Application Support/Google SketchUp 8/SketchUp/Plugins
ERROR: undefined method `GetString' for nil:NilClass

Have been using sketchup on a pc for 6years. Now on a 27" corei5 imac. Have trouble finding auto-saved files. Sketchup configured to autosave every 5 mins. Happens sometimes, but have had 2 files "untitled" which haven't shown up anywhere......do i need to name these for autosave to work? I did have 2 untitled documents open at same time..maybe i confused the Mac.
This ability to have several files open at once on a Mac ....any advice on its use?

Also noticed that files saved in ":documents" don't adhere to "last modified" request....they are all over the place....(timewise)...I thought Macs were invincible, but not so sure now.

Also, have found painting with textures and colours etc a bit difficult...the pc method seemed so much easier with onscreen colours etc being modified instantly as colour- sliders etc are being altered.Is there a tutorial out there for the Mac method?