Same problem!
WordPress 2.8.x
BBpress 1.0.2
Just did a completely clean install. No plugins even, yet…and the theme thumbnails aren’t available and when i activate any of them i just get a generic page with no css or layout of any kind. 
What gives?
http://www.oktearoom.com/forum
		
	 
	
	
	
 
		
			
	
	
		
		I move them to the bb-template folder and it works…but…etc etc
		
	 
	
	
	
 
		
			
	
	
		
		What permissions do you have on your wp-templates folder?
		
	 
	
	
	
 
		
			
	
	
		
		Good call Ipstenu… bbPress 1.0+ creates those folders itself rather than having users create them, which can lead to permissions problems:
https://trac.bbpress.org/ticket/1139
		
	 
	
	
	
 
		
			
	
	
		
		my-templates are 750, you’re saying it should be 755?  Does that apply to my-plugins too?
Anyone want to tackle my other problem? (https://bbpress.org/forums/topic/wordpressmu-bbpress-theme)
		
	 
	
	
	
 
		
			
	
	
		
		That was a stab in the dark too, johnjiler!  Yes, change the folders to 755.
		
	 
	
	
	
 
		
			
	
	
		
		Nice stab, Ipstenu!
I thought the template permissions issue was fixed in 1.0.2 though…  maybe the folder was created by an earlier install version?
		
	 
	
	
	
 
		
			
	
	
		
		Thanks Ipstenu!
John, to be honest I don’t remember, I’ve uninstalled, installed, new database, imported database, that I don’t remember.   I’m having issues with my new found toys WPMU+BP+BB
		
	 
	
	
	
 
		
			
	
	
		
		Thanks guys!  ::bows::
That was really frustrating for such a simple fix.