On 8 Jul 2016, at 15:42, Carpii UK wrote:
[…] it is even opening the wrong file when I dblclick from the File Browser on the left.
Is this a local HFS+ file system?
Have you tried relaunching TextMate? And if so, try also reboot your machine, because it sounds like something is seriously messed up.
And just to be sure I understand this correctly, when you do open file A, and file B opens, the proxy icon / title bar etc. will point to B, right?