You have omitted some code and added in other unneeded code. Try: ` # Load the normal support files. require 'sketchup.rb' require 'extensions.rb' Create the extension. ext = SketchupExtension.new('pluginName', File.join('pluginFolder', 'pluginLoader.rb')) # Optionally 'name' the Extension - it can differ from the registered name. ext.name = 'pluginName' Attach some nice info. ext.creator = 'xxxxx' ext.version = '1.0.0' ext.copyright = '2016, xxxxxxxx' ext.description = 'xxxxxxxxxxxxxxxxxxx' # This 'path' is NOT needed. ext.extension_path=File.join(File.dirname(FILE), "pluginFolder" ) Register and load the extension on startup. Sketchup.register_extension(ext, true)` Add in the bold code and remove the struck-through code...

Wow! This is awesome! It works! Thanks a lot. I almost gave up! Good to know, that there are real experts in this forum who are willing to help. Thanks again.

@sonjachr said: Many Thanks, this works, I really appreciate your help! I feel ashamed as I should have found the solution by myself. I will try to work harder on my Sketchup/Ruby knowledge, but I will never become an expert as you are. Great, glad I could help.

Just published the API in the main TopoShaper thread. Documentation is attached in the main post. Fredo

I think you need to use another thread for the WinForm windows, e.g MessageBox. I checked the following code. It works. It actually makes more sense to let the WinForm window in a separate thread other than the Sketchup's thread. Imports System.Windows.Forms Public Class MyFunctions Private Sub showMessage(ByVal msg As String) MessageBox.Show(msg) End Sub Public Function AddMyValues() Dim Result As Double Result = 20 Dim t1 As New Threading.Thread(AddressOf showMessage) t1.Start(Result) Return Result End Function End Class

Hi John, many thanks for your quick reply. It was really helpful. I am now using the command line of winzip in my Powershell script, as you have proposed. The generated RBZ file is now working on my MAC also. Thanks a lot for your help. Sonja

**It works!**Thanks a lot, you saved my weekend!