Recently we upgraded our project to the latest version. After Upgrading the vs ide shows an error when opening forms in design mode --> "The path has an invalid format" (translation from german). It is not possible to open any forms in design mode. After analyzing the app we encountered that the licenses.licx file is empty after upgrading??
Steps to Reproduce:
Upgrade Project to 7.3.6
You should rebuild your project before you'll be able open forms in design mode. Please close all form designers and select Build | Rebuild Solution menu item. I also advise that you review the Troubleshooting design-time problems article.