woodvorg wrote: > Can't seem to find anything like that in the layout file.
But you have Input amsdefs.inc in there which itself has Provides amsmath 1 This is because the ams classes, for which amsdefs.inc is written, load amsmath by themselves, and therefore LyX must not load it again. Writing Provides amsmath 0 somewhere _after_ the amsdefs inclusion in your layout file might fix the problem. HTH, Jürgen