From memory, not sure about it, but app might link to very few OSX libs, if that was the issue, great chances that app would just crash or not even start.
Could you enable logs (by uncommenting last part of /Applications/Deluge.app/Contents/MacOS/Deluge script) and give a look at/paste them?

Haven't upgraded yet to Mountain Lion, but I think there is now a built in Firewall, could it be that?

Nope sorry, some work to do on this side. You can use classic mode until.

Magnet links are not currently supported by Deluge OSX. Deluge use GTK-OSX, which did not support "URL schemes" last time I checked. (opening/sending an URL to an app) And I guess that didn't changed since. I'll try to give a look someday... Looks interesting: https://github.com/pheller/ig...

preferences > Uncheck classic mode maybe?
then connection manager should be accessible

Sorry no update recently, had tons of work. Good news for the lucky mac book retina owners, Deluge.app (GTK-OSX in fact) support it, just a small change is required! Until I generate a new binary, you can fix the current version using the following steps: Select Deluge.app in Finder In the context m...

I think you are, but I guess something like os.path.join(status["save_path"], status["name"]) might be preferable than + '/'

Funny, that's exactly the patch I wrote ;) , tested, works. diff --git a/deluge/common.py b/deluge/common.py index 4881d16..29c37e8 100644 --- a/deluge/common.py +++ b/deluge/common.py @@ -241,6 +241,8 @@ def open_file(path): """ if windows_check(): os.startfile("%s" % path)...

Ah nice catch, as usual, using Deluge with a remote server, never noticed that one (which is disabled&hidden when using a remote server) I guess it would be easy to do by calling OSX "open" instead of linux "xdg-open"... Yup that's it, works on my laptop. Fix will be in next ...

Here is the interesting part I think, I guess you opened the pref dialog > blocklist > download > close, twice. This is the second time : ... [DEBUG ] 20:37:36 menubar:264 on_menuitem_preferences_activate [DEBUG ] 20:37:36 pluginmanager:103 run_on_show_prefs ... nothing?! I guess you tried to downlo...