There is an error in the “About xsec” dialog of the Microsoft Windows version in that the telephone number is wrong. (Versions 5.1.1 and earlier.) The number as presented includes “98”. This should be “89”.
The telephone number in the “About xsec” dialog of the Apple OS-X version is correct as presented.
January 27, 2016
A new version of the application, version 5.1.1 has just been released.
The previous version, version 5.0.14 had a problem in that the graphics did not appear correctly on an Apple Retina screen. This has been fixed in version 5.1.1.
Apart from this correction version 5.1.1 is the same as 5.0.14.