No Grabs take place when using Black Hole as search method

Hi,
I have just migrated from SickBear to Sonarr.
In SIckBeard I used the Black Hole search method so I decided to use that in Sonarr.
Unfortunately I get no results. No NZBs are being grabbed.
I set up Sonarr by following the HTPC Guide so I’m fairly sure everything is set correctly.
But perhaps there is something that I have missed.

I am running on Windows 8.1 Pro X64 and my browser is Firefox.

What download client do you use? If you use SAB or NzbGet as your download client you should definitely use the proper download client within Sonarr, it will yield a much better experience.

Did you configure your indexers? 0 results means either they are not configured for search or nothing was added.

Please pastebin ((debug logs)) of a search.

Just installed SABNZBD and it seems to be working, so I guess my indexers (OZNZB and Omgwtfnzbs) are set up corectly.
However I would prefer to be able to control the scheduling and speed of the downloads via Newsleecher rather than leaving it up to SABNZBD.
Is there any reason why Usenet Blackhole would not work when Sabnzbd does?
I

Unable to write the file properly is all I can think of. Logs will show whats going on.

Can’t see anything in the logs.
Not to worry, since Sabnzbd works I’ll go that route.

Thanks for your help.