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You can still cast while the sphere is in effect. Moving the sphere requires you to give up your move action, but it does not require you to concentrate to keep it in existence. You can still cast whether you move the sphere or not.
From the spell description...
The sphere moves as long as you actively direct it (a move action
for you); otherwise, it merely stays at rest and burns.
MisterSlanky
(Pathfinder Roleplaying Game, Adventure Path, Campaign Setting, Companion, Battles Case Subscriber)
If you are a 3rd level Mage or higher and have cast Flaming Sphere can you move the sphere (move action) and still cast a spell? If no, can you choose not to move the sphere and cast a spell?
A buddy and I don’t see eye to eye on this. I think you could still cast spells, (casting time permitting) he says no other spells can be cast while this spell is in effect. I say Flaming Sphere has no concentration requirement in its duration descriptor.
So, in short who is right?
The spell's pretty clear on this one:
The sphere moves as long as you actively direct it (a move action for you); otherwise, it merely stays at rest and burns.
Additionally, as you indicated, the spell has no concentration component (it stays still if you don't move it). Since you the caster get one standard action and one move action every round, you can move the sphere as your move action and cast a spell as your standard action (level 5 druids rejoice from your calling lightning and moving the sphere each round).