[Calistn]

I have been using calibre for awhile now and love it. Mostly everything works fine and I have no problems.

Sometimes though I will convert a file from pdf or txt and get odd symbols showing up in my mobi version. Most time I can correct this by editing the orginal file and correcting the errors using the find and delete or find and replace text editing.

Sometimes though I will get a file convert it and when I open the converted mobi file or even the txt file on the pc everything is fine but once in a blue moon I will get weird characters or symbols show up after transferring it to my kindle.

For example one book I have everything is fine in txt and mobi formats on the pc but if I put the mobi format in my kindle if has a ? (in a odd square) placed randomly throughout the text. If I just stick the txt file in the kindle all is fine just like on the pc.

Any ideas what causes this and how to fix it?