Foamdad: My cleric's WIS is 14, so he should be good up to 4th level spells (WIS + spell level). As a TN Sun/Healing domain Cleric, I should have Searing Light and Cure Serious at 2nd level, neither show up and, like I said, there are certain spells that I can memorize, but can't cast although I have no alignment restriction. That's the part I can't figure out.
Hickory: Are you sure you don't have some other negative ability modifier active that's preventing you from using these spells? I just tested a new game and granted my toon XP to level 3, and those spells are all there. It's not a game bug.
Here's an extra little twist: I just restarted a new premade character provided by the game, which by coincidence, had the same domains as my original cleric. At 2nd level, none of his domain abilities showed up either. He had a 16 WIS, so he should have been good. He also had the same greyed out spells in his spells radial. Weird.
Out of curiosity, what domains did you choose for that new character you mentioned? If you have time, or are so inclined, try starting a new toon with Sun and Healing and see if the domain abilities show up.