[luxor]

I had strange errors with my web master mode as well, it was actually causing visual modifications to my site everytime i opened web master mode.

I was able to solve this problem by upgrading my smarty files.

check the name of your smart folder , if it is below 2.6.18, then download the latest version of smarty , upload it , and change reference in smarty.php and run cleanup.php after. see if this helps.