Strange behaviour of an C# Excel plugin
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Hi, I have developed a Excel plugin using .NET 2003 two months ago. The plugin simply adds some buttons on the toolbar. Everything worked fine before. The plugin is installed by MSI. And now I open Excel again and the buttons disappear! Then I uninstall the plugin and reinstall it with the MSI I build two months ago. And the buttons do not appear, too. So, I open the plugin solution and decide to rebuild the MSI. When I open the solution, a error message "80004002" prompted and ask me for yes/no. No matter I chose yes/no I can still enter the solution and rebuild the plugin MSI. The error message didn't prompt next time. And the result is that the MSI successfully installed the plugin and I can see the buttons again. What's happened? Will the same thing happen again after two months from now? Thanks