Since when it is not working anymore? Are you working in a new workstation?

I have been doing the reinit command, I even docuent the date using the F5 key to keep up with the date of changes, I will search for any other .PGP Files and see if perhaps there is a conflict. I added 4 aliases that work. tx for Text Standard, bk to make a block and wk to write a block. In the same .pgp file I added the *les     and the command that you can type manually. I think it was DIMASZ or something like that. It has to do  with setting the size of the Leader Arrow head. In an older version of autoLT I had also used ex for Explode and it worked for years, but now it will not work either, I have learned that x works, so I am having to just adapt. I normally search the whole file with find checking that there is not already another use of the letters I choose. Thank you for the reply.

Are you putting your aliases at the bottom of the pgp file, in the user defined section or are you just editing the aliases in place?

Autocad reads the aliases in the order they appear in the pgp file, so if you're editing your aliases in place, EX is already being used for Extend, so it can't be used for Explode because Explode is found further down the list. If you want to use EX for Explode then you will need to redefine the alias for Extend.

If you place your custom aliases at the end of the pgp file, in the user defined section, they will override existing aliases, but you will still need to redefine the alias for Extend if you want to use EX for Explode.

You said some of your changes were working.  To me that would indicate you are editing the correct PGP file.  As to why some work and others don't I think you'd have to inquire at the AutoDesk Discussion Groups in the Customization area.  Maybe someone from within AutoDesk itself could provide you with an answer.