Upload a clean new install of the version you want. Get it working with the demo blogs. Then start uploading your previous files bit by bit. Start with conf, then media, then plugins and finally skins. Test each time and hopefully you will find what is causing the problem.

You could also download clean new versions of your plugins - it never hurts.

I am using all clean files. The only old file I've put back in the basic config file :(

Use another brand new set of files for your new version. The thing is if you got a crapped up file somewhere there's no way to know exactly where. So if you download a new copy and unzip it and delete stuff from your server then replace it with the brand new stuff you'll be eliminating a million possible sources of file corruption all at once.

I'd actually start with just the /inc/ folder because that's where 90% of everything happens.

Remember to delete the stuff on your server, then replace with brand new stuff. Quite important that *if* you have a bad file it goes away and gets replaced. Only way to ensure that across all situations is to first delete then upload.

Okay Ed thanks... will start again now. I have five to update.

No dice :(

I used my cpanel to delete all the files and the directory showed empty.
When I went in to compare the inc folder after trying the upload again, the file with the error was different on the server. I don't know how that can be if all the files really deleted!?

Going back thru folder by folder now to try again.