Thank you for the response!

I accidentally found a workaround. The plugin sometimes works if I double-click the toolbar's button quickly.

Need help urgently. My Curviloft stopped working suddenly, review due in 5 hours!

Below is the detail:

Fredo6 Plugins Information on 2026-05-20 12:02:23 +0800

• Platform: x64-mswin64_140 - Ruby: 3.2.2
• Sketchup: 26.1.256
• LibFredo6: v15.9c
• LibFredo6 Binary loaded
• Sketchucation ExtensionStore: 5.0.7
  #<FrozenError: can't modify frozen #Class:SCFLicense: SCFLicense>
  c:/users/vincent_loh/appdata/roaming/sketchup/sketchup 2026/sketchup/plugins/sketchucation/scflicense/scflicenseruby.rbe:322:in transfer_done' c:/users/vincent_loh/appdata/roaming/sketchup/sketchup 2026/sketchup/plugins/sketchucation/scflicense/scflicenseruby.rbe:378:in initialize'
  c:/users/vincent_loh/appdata/roaming/sketchup/sketchup 2026/sketchup/plugins/sketchucation/scflicense/scflicenseruby.rbe:81:in new' c:/users/vincent_loh/appdata/roaming/sketchup/sketchup 2026/sketchup/plugins/sketchucation/scflicense/scflicenseruby.rbe:81:in dynamic_token'
  c:/users/vincent_loh/appdata/roaming/sketchup/sketchup 2026/sketchup/plugins/fredo6_!libfredo6/top_libfredo6.rbe:824:in info' c:/users/vincent_loh/appdata/roaming/sketchup/sketchup 2026/sketchup/plugins/fredo6_!libfredo6/lib6plugin.rbe:372:in block in populate_support_menu'
  c:/users/vincent_loh/appdata/roaming/sketchup/sketchup 2026/sketchup/plugins/fredo6_!libfredo6/lib6traductor.rbe:1569:in `block in add_command'