I found if I had spells memmed (or maybe even just scribed) from an old spell list, then changing my spell list (by exporting a modified one), I wasn't able to cast any spells. When I created a new char, the problem went away. 
 
Also, check that the map files exist on your server. I think that can cause spells to not be castable. 
		
	
		
		
		
		
		
		
		
		
		
	
		
		
	
	
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