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Hello, I am sorry to hear about this.
The white page probably means there's a fatal PHP error somewhere. If you saw no fatal error when the errors were shown on screen, then you need to look in the error log for your website (because fatal errors are not always shown on screen). Cause the error to happen again, and then check the log right away, the error should be recent, near the end.
Or you can use an .htaccess file to turn the php display_errors directive on, but if you don't understand what that means, then you should probably stick to checking the error log.
If that doesn't turn anything up, you could open up the modules/imenu/blocks/imenu.php file and look in there for the text "imenu". It could be that there's a reference to a function name or something else that was not changed by the script, and that's what's causing the error. If you can find any references to "imenu" still in that file, let us know what they are and we can update the script to catch them probably.
Let us know what you find, I hope this helps.
--Julian
