Could you please consider posting specifications for the 24 MHz crystal so that I can make sure to purchase a crystal that meets the requirements?
Datasheet Table 63 lists Cload and typ ESR for the 32 KHz crystal, but no similar table elements are given for 24 MHz. I do see from the Tower board BOM that it used an 18 pF Cload, but I want to make sure this meets the DS requirements -- is 18 pF the datasheet required Cload?
Of more concern is the unknown typ or max ESR required. For 32 KHz, the ESR is listed as typ, but it is MUCH preferred if you could specifiy a max ESR value since this is by far the most common specification found on crystal datasheets.