Diagram View is not opening

Hi All,

I am unable to open the Diagram View in NWDS. It was workiing fine yesterday but dont know what happenned and it's not opening now.When I click it, it displays a message "opening in progress", but the page is not getting opened.

I read the threads related to this also, and the best possible solution I found is to delete the .metadata folder, but i'm not that confident and affraid of doing that. We have many projects inside that and dont know how it will impact on it.

Please help.

Regards,

Nikesh Shah