I am certainly not a testing expert, but I will be interested in hearing some further opinions on this.
I have a hard time seeing how missing the easy questions suggests a processing disorder. Perhaps there is something else in the results that the tester was referring to. That phenomenon is not uncommon with gifted kids, and is often just an indication that the easy questions don't capture their full attention. My DD is very much like this. She hit the ceiling of quite a few subtests (i.e.--did not reach the discontinue criteria) even though she did not necessarily get top subtest scores.
You might post this question to the TAGFAM GT-Families list on ICORS (I think that's the right name). There is an excellent testing professional who frequents that list, although I think she may be swamped at the moment.
