When saving by right-click on component in plugin window:

Error: #<NoMethodError: undefined method `chr' for "R:":String>
C:/Program Files (x86)/Google/Google SketchUp 8/Plugins/BGSketchup/BGSketchup.rb:44:in `BGSketchup_creer_lien_relatif'
C:/Program Files (x86)/Google/Google SketchUp 8/Plugins/BGSketchup/Composants/Rb/Composants_Main.rb:539:in `enregistrer_definition'
C:/Program Files (x86)/Google/Google SketchUp 8/Plugins/BGSketchup/Composants/Rb/Composants_Main.rb:52:in `initialize_window'
C:/Program Files (x86)/Google/Google SketchUp 8/Plugins/BGSketchup/BGSketchup.rb:44:in `call'
C:/Program Files (x86)/Google/Google SketchUp 8/Plugins/BGSketchup/BGSketchup.rb:44

Reload old file:

Error: #<NoMethodError: undefined method `chr' for "R:":String>
C:/Program Files (x86)/Google/Google SketchUp 8/Plugins/BGSketchup/BGSketchup.rb:44:in `BGSketchup_creer_lien_relatif'
C:/Program Files (x86)/Google/Google SketchUp 8/Plugins/BGSketchup/Composants/Rb/Composants_Main.rb:662:in `charge'
C:/Program Files (x86)/Google/Google SketchUp 8/Plugins/BGSketchup/Composants/Rb/Composants_Main.rb:558:in `recharger_definition'
C:/Program Files (x86)/Google/Google SketchUp 8/Plugins/BGSketchup/Composants/Rb/Composants_Main.rb:53:in `initialize_window'

Saving to an older file with auto revision level

Error: #<NoMethodError: undefined method `chr' for "R:":String>
C:/Program Files (x86)/Google/Google SketchUp 8/Plugins/BGSketchup/BGSketchup.rb:44:in `BGSketchup_creer_lien_relatif'
C:/Program Files (x86)/Google/Google SketchUp 8/Plugins/BGSketchup/Composants/Rb/Composants_Main.rb:539:in `enregistrer_definition'
C:/Program Files (x86)/Google/Google SketchUp 8/Plugins/BGSketchup/Composants/Rb/Composants_Main.rb:52:in `initialize_window'
C:/Program Files (x86)/Google/Google SketchUp 8/Plugins/BGSketchup/BGSketchup.rb:44:in `call'
C:/Program Files (x86)/Google/Google SketchUp 8/Plugins/BGSketchup/BGSketchup.rb:44