I've reported the same problem -- if there's an empty tab, OmniWeb won't use it for links opened by other applications. This has been the case since OW 5.0 (it never handled this correctly), but I wouldn't say it's a bug; it's doing what it's supposed to do: opening links from other apps in a new tab. It's just not checking if an empty one was already available.
However, the fact that blank tabs are labelled "Loading..." is new in OW 5.5. Obviously this is not the correct behavior, but again, not so much a bug as a situation not handled correctly. This one can't be too hard to fix, and IMO it would come across as a bit sloppy if it's still doing that in the final release.
Although I'd like to see both of these problems solved, I'm sure there are heaps of more important ones to be dealt with first.
Last edited by Stormchild; 2006-08-10 at 08:15 AM..