Arrgh. I hope that "check for updates" is fixed. MacMiner has been telling me that 1.3.17 is the newest version for… since 1.3.17 came out.
Looking forward to seeing what you've done!
As a note, a couple of versions are always available in the first post or at http://fabulouspanda.co.uk/macminer/ and the previous minor versions are still downloadable, i.e. if you're now downloading http://fabulouspanda.co.uk/macminer/downloads/MacMiner.app-1.4.8.zip you can assume that 1.4.1 through 1.4.7 are in the same downloads folder, just change the version number, so if an update to 1.4 breaks something and you don't have the last version you were using you can get it that way. I should probably make the folder indexable.
There are a few significant additions to come soon so I'm working with a plan towards a version 1.5 which should be the next stable version - once that's out I'll set it up so 1.3.17 users are prompted to upgrade.