Never mind, I fixed it by changing the Manual Port Forward to 45000! I would advise anyone with the same problem to try this.

I used to get one bar on connection, active downloads would continue downloading (but at veeerry slow speeds) but I could not get the search function to return any results.

Switching the Manual Port Forward to a number between 45000 and 60000 worked a treat! 45000 was the first number I tried, so it might work for you too!