time machine permissions problem

I had to use my "trusty" Time Machine backup yesterday for the first major disaster. I had done a text string 'search and replace' of about 150 html files using BBEdit and accidentally chose the wrong folder! So I figured, no problem, I'll just restore from my Time Machine backup. I entered Time Machine, found the folder from last night's backup and restored it to my desktop and got this message:

The operation can't be completed because you don't have permissions to access "folder_name".

Some of the files were restored but the process stopped about a tenth of the way into a folder which is 4.13 GB in size. Not cool. I've used Time Machine many times to restore one single little file and it has worked perfectly but trying to restore a folder with 4.13 GB of data failed royally.

Any ideas what may be wrong? I don't think I trust this Time Machine setup at all after having this happen. I manually (religiously) back everything up to two external drives every night as a failsafe. Thank God I do that because it's the only way I could get my files back.

I went here for help but this says it is for Leopard 10.5 (and I'm using Snow Leopard 10.6.8):

http://pondini.org/TM/C5.html