Very happy long time user until a reboot today prompted for an 'upgrade' to the latest (2.74a) version of MP3TAG. After install, application crashed immediately after calling up webpage of 'thank you for updating'. Tried downgrading stepwise through the versions until I found one that wouldn't crash: v2.72.
That's where I'm at.
Ubuntu 14.04.4 with all updates. Linux 3.16.0-60-generic #80~14.04.1-Ubuntu SMP