This will most likely be because you are running a very old version of Music Miner. Updating it would be your best bet.
You can get the installer for the latest Version1 build here: http://download.shedworx.com/musicminer/beta/JakstaMusicMiner-1.4.2.pkg
There is a good chance you will receive upgrade prompts to Version 2, which is a PAID upgrade that we released earlier this year, but it is not mandatory. You can turn off the prompts by going to Preferences > General and turning off the feature that does auto-checks for updates on startup.
There is a discounted upgrade offer for existing license holders, which can be accessed by following the prompts in the update checker pop-up notification.
Please be aware that we will not be releasing any more updates for Version 1, as we are focusing our development on Version 2.
I'm using Music Miner 1.2.3 (073) on OS X El Cap 10.11.2 and track look up has stopped working.
Download is ok, but none of the tracking are identifying. Any suggestions? thanks,