Help with Acquisition for Mac

[DownloadGnut]

Sorry if this is posted in the wrong place but I am struggling with Acquisition. For many years this app worked fine for me but over the last couple it's been rather useless. Emails to the developer, searches for an Acquisition-dedicated forum have all failed. Maybe you guys can help or point me in the right direction. I paid for this app and it's now a lemon. I am having the following problem:

When Acquisition is opened it loads fine and starts downloading. After a short while which can vary from a few seconds to minutes, it simply loses all connections at once (or almost at once). It doesn't reconnect any new connections. If I then try to quit it says it's still downloading and checks if I really want to do so. Download items are shown as active but obviously nothing is being downloaded. Basically, the app is only useful if I want to sit there and restart the app every few minutes.

I am using the default ports.

Despite my router (Netgear DG834N) using UPnP (which is on), I don't see the Gnutella and BitTorrent ports being opened in the UPnP table (while other ports are opened by other apps). I have manually opened these ports. Doesn't help.

I would be thankful for any help.