Sync closes open stack in shortcuts

[Nick Harrigan 3]

I'm using the latest version of Evernote for Windows (6.0.6.1769 (301769) Public.

When I press the Sync button then the stacks of notebook which I have expanded/opened in the shortcuts menu close.

Does anyone know why this happens or how I can stop this? Is it a bug? I've been using evernote for several years and never encountered this problem until the latest update.

Thanks