Font selection problems

When using compatibility mode, it is possible that you will find problems with font-changing commands in some old documents. These problems are of two types: In case of error messages it is possible that the document (or an old style file used therein) contains references to old internal commands which are no longer defined, see Section~#Secoldinternals#537> for more information if this is the case. One example of the unexpected is if you use one of the new style of math-mode font changing command as follows: verbatim24 You may well find that this behaves as if you had put: verbatim25 everything including the A coming out bold. LaTeX~2.09 allowed sites to customize their LaTeX<#539#><#539#> installation, which resulted in documents producing different results on different LaTeX<#540#><#540#> installations. LaTeX2e<#541#><#541#> no longer allows so much customization but, for compatibility with old documents, the local configuration file 368 is loaded every time LaTeX2e<#542#><#542#> enters LaTeX~2.09 compatibility mode. For example, if your site was customized to use the New Font Selection Scheme (NFSS) with the 369 option, then you can make LaTeX2e<#543#><#543#> emulate this by creating a 370 file containing the commands: verbatim26 Similarly, to emulate NFSS<#544#><#544#> with the 371 option, you can create a 372 file containing: verbatim27