I can send test project in private. Latest build 341 as of March 26th 2012.
Project runs fine but I'm flying blind when it comes to any layouts in designer because they just don't show up. Total blank. Initial View is a navigation view with 7 panels. Plan on splitting to several views.
Restarting should have no effect. Likely it's a coincidence. Know that when the canvas goes out it's because an exception occurred that we didn't anticipate. This can happen from a single or series of actions. A project archive and steps to reproduce are of great value to us. This helps the designer team, you and the community at large.
Sencha Architect Development Team
Thanks for providing your project file. The reason your view is not displaying is because you have added fullscreen:true as a custom property on it, which prevents Designer's canvas from rendering it properly. You should not need this property since it gets added automatically when you mark it as the Initial View, so you can remove it safely.
Thank you very much Jason for your very quick response.
Love the product. I would have continued to use it despite not being able to use the design view but I'm very glad it was my fault.