Problems with entering spell lists for lvl 21+ Characters

I have found that the spell lists are no longer editable for spellcasting classes if you enter a level greater than 20. I cannot enter the spells usuable by that character at lvl 20 and then increase the level above 20. It removes the spell lists.

Is this a known bug or is there something I am doing wrong.

As a temporary workaround I have made a second class for Epic level characters labled (for example) Wizard (Epic). For 10th, and up to 19th lvl spell slots I use the 0-9 slots. I have also created spell lists the players use on their characters and added to both text files for the "spells" and "classes". A
n Intensified fireball would be normally (without Epic feats) a 10th lvl spell so I have put this in the 0 level spell slot of the "Wizard (Epic)" class.

I would like to see usable spell tab interface that had tabs up to 20th lvl spells and be able to add spells to the tabs for characters over 20th lvl.

Thanks, and your product has made playing D&D for people in my group from here in the USA, to Iraq, to Antarctica all in one session. Thanks