Just a thought...
If your having multiple probs and then Curse wont download and install correctly either u might wanna look outside of wow....Like run a virus scan,,and any other security app u have..i.e. spyware/spamware/trojankiller etc etc,Also make sure your version of windows is fully up to date...and if then still nothing try using the wowrepair utility..and then if even still u have probs..."I" would remove my wtf folder and reload game...see if it works then...and then if even still........well.....I would prolly do a pc recovery....but thats me..Your prob sounds very unique and not system wide..chances are its a messed up config file...
When u installed these new addons were there previous versions installed? 99% of addon authors require u fully delete the old version before installing a new one....to avoid potential probs....Good Luck...
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