Hi Andrew

It sounds like you are using an older version of the software on Mac OSX El Capitan. Unfortunately El Capitan introduced some features which are not compatible with older versions of HansaWorld software. The earliest version which works is Standard Accounts/ERP 8.0.

In the meantime you can reduce the frequency of this error by using keyboard shortcuts rather than mouse clicks.

Regards

Paul Timms
IT System Integrators Ltd