I'm still experiencing this. I validate the topology every day and am still receiving the same 70+errors that I've previously marked as exceptions. Has anyone else been experiencing this?
I don't think Arc Map remembers the exceptions. It has been a while, but my recollection is if you validate again, the previous exceptions are lost and you have to redo the exceptions. A little frustrating.
Nice to know that it does remember. I'll have to confirm that for myself next time I have to use it. I just recall wanting that functionality for the topology tools and not seeming to be able to get it; that is, it seemed like whenever I re-validated that it would re-highlight those that I had marked as exceptions.
The exceptions should only be lost if you edit the geometry of the feature that is excepted and then validate. Make sure you have dirty areas turned on and see if anything goes "dirty" during your edits. That could tell you more about what is happening. Esri should have dirty areas on by default.