StormNexus

Not sure if it bug or not.

When i got still spell feat and i try to put Still spell Clarity spell into slot then i close the book then rest then find the clarity spell on my quickslot is 0 so i open the book and find the slot was blank that where the spell is. then i try again and close the book then open the book and guess what. the spell i put in the slot is blank again. it seem the spellbook wont let me sloted the still spell clarity. someone help?

According to wiki, there was a bug prior to 1.69 coming out, in that you could not cast it as a still spell. Are you running the latest patch?

i did.

Not relying on buffs to keep your primary stat maxed out? ie. INT or CHA buffs that will run out when you rest so you may lose bonus spell slots?

no. It was on first slot and it went blank when i close the book or switch to other level of spell.

Sounds like an NWN bug to me mate.

There is a beta 9 patch that says it has fixed the clarity bug, you can try downloading it and updating here:

Clicky

Only thing is, its about 397Mb...

.......bah...

There is no beta. There will be no more patches. Bioware was told to mothball NWN patches after .69.
If you don't have .69 then you can't see let alone connect to the server. The only .69 patch you will ever need is the critical rebuild.