Back in the January beta weekend, I discovered this bug by accident. I reported it using /bug (and /feedback) and decided to keep the details to myself instead of telling everyone about it, hoping ZOS would fix it soon.
Since we just got a new build, which supposedly had tons of quest fixes in it, I tried this exploit again. It did not get fixed. I worry that bugs found by stress testers aren't getting looked at very thoroughly, because we're "just stress testers." But bugs such as this obviously deserve priority, because they can have disastrous long term effects for character progression.
I think that by going public with this information (the NDA is dropped anyway), it will be more likely that the developers will take note and see the urgency of getting this fixed. So I'm going to tell you how to get infinite skillpoints, with screenshots as proof.
It pertains to the Purifying the Wyrd Tree quest. This quest is on the Daggerfall Covenant side in Glenumbra. It's the final part of a questline that has some buggy spawns from elemental spirits (particularly the air one), so it's currently not easy to reach in the beta.
http://i263.photobucket.com/albums/ii155/Kaeldaron/TESO/Screenshot_20140315_172425copy.jpg
After you go inside, you fight the evil spirit that's corrupting the Wyrd Tree.
http://i263.photobucket.com/albums/ii155/Kaeldaron/TESO/Screenshot_20140315_172454copy.jpg
Normally, after fighting the spirit you gain a skillpoint, an achievement and a notification that you completed the quest. And then you're supposed to go outside to talk to the Wyress.
But let's not do that. What happens if we use the task manager to close the game while Angof is giving his monologue, and we log back in after? We get back into the Heart of the Wyrd Tree...
http://i263.photobucket.com/albums/ii155/Kaeldaron/TESO/Screenshot_20140315_174209copy.jpg
And we get more skillpoints!
http://i263.photobucket.com/albums/ii155/Kaeldaron/TESO/Screenshot_20140315_172818copy.jpg
Keep using the task manager to force close the game, just don't wait too long before relogging in because it will kick you out of the Wyrd Tree eventually, if your instance gets closed.
http://i263.photobucket.com/albums/ii155/Kaeldaron/TESO/Screenshot_20140315_174223copy.jpg
And just for good measure..
http://i263.photobucket.com/albums/ii155/Kaeldaron/TESO/Screenshot_20140315_182952copy.jpg
50 skill points! Wee! (that pose sure makes Victoria Crashius look extra tough)
If quest rewards are given out similarly in other quest instances, it's not unlikely that the exploit will work there as well. Anyway, this issue should not exist anymore by the time early access starts. For obvious reasons.