> For this a0poster, I have a0poster.layout under my ~/.lyx/layouts but > the class files have been removed.
After I remove a0poster.layout, reconfiguration stops at aastex, a regular latex class: +checking for document class aastex [aastex]... yes +checking for document class aastex [aastex]... yes +checking for package a4 [a4]... yes +checking for package a4wide [a4wide]... yes ... Bo