Lectora 18 not compatible with Lectora 17?

schowdhary9343 Community Member Posts: 1
I made changes to my title that was originally built in Lectora 17 in Lectora 18. Everything looked and worked great. However, when I opened the file next day in Lectora 18 again, all the colors had changed! The buttons also changed from circles to squares and their color changed as well.

Is Lectora 18 not backward compatible? What could have caused this issue?