Problem with version 26.2.1.2 [the formatting of guitar tablatures has changed; reinstalled 25.8.4.2]

I today upgraded to version 26.2.1.2 but when I open my writer files the formatting has changed especially documents that contain guitar tablatures (approx. 200). Unable to reslove or find a solution online I have uninstalled this version and re-installed version 25.8.4.2 which has rectified the problem