Toolbox won't open for one user

Hi everyone,

Up until monday my toolbox app was working fine, and now it won't open. 

We have the toolbox installed in /opt/ on a shared linux server (centos7), and my colleagues can open it fine. However for me the log gets to `uniqueApplicationKey` and then stops. 

I have no instances of the toolbox running on the system, not for me or any other user.

I deleted my .local Toolbox directory, as per the 'how to uninstall' instructions, and I downloaded v 1.15 which is also in /opt/ and again no luck. 

Help much appreciated.