Solved! Go to Solution.
This is what I figured out, thanks Craig. Makes total sense now...:)
What doesn't make sense is where 10.0 and 10 SP1, support editor tracking , and SP2, SP3, SP4, and SP5 don't support editor tracking.
Another more serious issue, is after enabling editor tracking on a 10 sde database (then disabling it), the 10 access speeds have slowed to a crawl. We started on 10.1 updates because of the issue. 10 minutes to select a record and have it show up in the Attributes window. When relationship classes are in place, the table fields have a serious lag time. Editing Anno has slowed to a crawl.