Unable to add a new tab with URL target

Unable to add a new tab with URL target

Hi, I am unable to add a new tab with a URL as a target. When clicking OK, it simply reports, "Please enter the URL".
 
I have tried various forms. The URL I want to include is the Storage view of opmanager, however I have also tried simple URL's, such as www.google.com.au for testing, and all give same result.
 
See the screen shot attached.
 
Cheers

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