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~#Sec:oldinternals#556> for more information if this is the case. L^ATEX~2.09 allowed sites to customize their L^ATEX<#557#><#557#> installation, which resulted in documents producing different results on different L^ATEX<#558#><#558#> installations. L^ATEX2_e<#559#><#559#> no longer allows so much customization but, for compatibility with old documents, the local configuration file |latex209.cfg| is loaded every time L^ATEX2_e<#560#><#560#> enters L^ATEX~2.09 compatibility mode. For example, if your site was customized to use the New Font Selection Scheme () with the |oldlfont| option, then you can make L^ATEX2_e<#561#><#561#> emulate this by creating a |latex209.cfg| file containing the commands:

Similarly, to emulate <#564#><#564#> with the |newlfont| option, you can create a |latex209.cfg| file containing:

Font selection problems