Clockworkmod won't take

ATT Captivate, official 2.2 update installed via Kies Mini.  As far as I can tell I'm rooted, superuser permissions granted to Titanium Backup and ROM Manager, both of which function correctly.  Also sideloading enabled, as Titanium Backup doesn't complain about not being sideloadable anymore (you know, the warning where it complained you might not be able to restore apps since sideloading wasn't enabled?  I don't see that anymore.)  I absolutely cannot get the Clockworkmod update.zip to load.  Every time I try, I get the error about how it can't validate the whole file signature.

I've read many various google search result links talking about all sorts of stuff that doesn't seem to apply to me.  I can get into the recovery mode, and I select reinstall packages and get that error.  I've tried using update.zips from ROM Manager, manually going out and finding the right one, and one that was a different size and I think probably associated with 2.1.  I've tried copying the file myself and letting ROM Manager do whatever it needs to.  I've tried doing reinstall packages several times in a row.

I had OneClickLagFix installed but before doing any of this I used OCLF to remove the lag fix and remove the ext2 tools and uninstalled it.  Phone functions fine (albeit as slow as it did before OCLF.)  Made backup with Titanium and everything.

What's next?

--
Daniel

Edited to add:  Forgot to also say, I tried various settings of USB Debugging, tried it with the power cable plugged in and not plugged in, uninstalled and reinstalled ROM Manager, had Titanium put in a diff BusyBox since someone had mentioned that may have helped them.  I rooted with Super One Click Root or something like that...used that same program to enable sideloading.

Edited again: Error message is
E:failed to verify whole-file signature
E:signature verification failed
I just ran Super One Click root again to make sure I had it all right.  One thing I noticed is that I tried to us SOCR to get an unlock code (the only command button available on the Samsung Captivate tab) and it failed with FFFFFF coming back?  No clue if that's important right now or not.

I'm having the same problem.  Nice to know someone else is too, but not so nice that it is a problem.

http://dl.dropbox.com/u/17523546/Clockwork_Recovery_Rename_To_update.zip

that link will give you an update.zip file that will get you directly into clockwork when you do the install update.zip from recovery mode will take two times to get into though

just rename it to update.zip to get it to work

Iam having the same issue. I have tried everything! Is there anywy to bypass this error other than using the "update.zip" process???

Please help!

If your'e too cheap for root explorer, look up super manager.

There are no costs for becoming a member, simply sign up and download the file.  I tried to post it here for you but for some reason it wont post, so you're going to have to sign up and download.

alright guys I'm wanting to go back to custom roms and have a new phone and am having the same problem.  YOu guys are speaking in a language I don't understand and I"m usually pretty tech savy.  I need someone to break this down exactly how to pull this off.  Its like "open a terminal emulator and type this"  ok where do I get a terminal emulator and how exactly is it going to know where my file is?  Can someone do a full type up on how to replace the recovery?

EDIT nevermind I was making this way too complicated.  Download, extract, connect your phone to a PC, and doubleclick install.bat.  Hopefully it worked, I'll find out soon enough