[Ken Case]

Yes, that's right: in OmniWeb 5.1, pasting a URL into a web page did open a new tab for that URL, and we seem to have lost that ability in 5.5 (no surprise, since it's now a WebView rather than an OWKHTMLView).

It looks like the problem is that the WebView is disabling the Paste menu item because it's not editable, which doesn't let Paste continue along the responder chain and find our controller which would, in fact, allow you to paste. I think we can probably fix this fairly easily by intercepting the menu item validation at the window level (before it reaches the view).