Hi everyone,
I just tested Haley's XML in BEAUit 2.5.2, and I had no problem to save my changes in both clock model and tree prior. The changed XML is attached.
Can you please always use the latest released version? If you still have the same problem, please give us some details of the process and your system. In addition, as Remco suggested, the message from the menu "Help/Messages” would be very helpful to identify the problem.
For example, I used Mac OS 10.14 and Java 10. I loaded the XML into BEAUti 2.5.2, and changed the Yule to Coalescent Constant, and changed Relaxed clock to Strict clock, and then saved the file.
Cheers,
Walter