Have had this error for a while now, quite annoying, have updated all SVN's, have ran a .bat to clear cashe that i got on the forums here, basically just deletes wow/hb cashe and updates your svn if you have it setup, i still update manually to be sure, currently running HB- version 2.5.10739.737 which seems to be the most updated version via bot downloads/forums, any help would be greatly appreciated! would love to get back to my weekly raids before tuesday 
