Cecy, Please don't post your email address on these forums. Support is not offered that way.
Having reconfigured my pages last night
What did you reconfigure? I don't think it's a permalink issue because the posts on your site work when I visit your site.
Try the usual troubleshooting steps:
- deactivating all plugins to see if this resolves the problem. If this works, re-activate the plugins one by one until you find the problematic plugin(s).
- switching to the Twenty Eleven theme to rule out any theme-specific problems.
- resetting the plugins folder by FTP or PhpMyAdmin. Sometimes, an apparently inactive plugin can still cause problems.
- re-uploading the wp-admin and wp-includes folders from a fresh download of WordPress.
After those steps see if the post preview works again.