I've developed a website for a client and was ready to launch (move to root directory). I selected the update link with my host's control panel last night to update from 3.5 to 3.5.1, which resulted in a lengthy error message. When I checked on my files and folders in the file manager, I noticed that the wp-includes folder was no longer there.
I didn't have the folder backed up but tried to download WP and upload the original wp-includes folder, to no avail.
I have the database and stylesheet backed up. Is it easier to just reinstall wordpress and then overwrite the stylesheet and database?
The host's tech support staff is proving to be absolutely useless on the issue. I didn't pick them and have urged client to look elsewhere for better host.