Pablo,
Can I suggest an addition to this page https://wysiwygwebbuilder.com/preview.html to ensure they check that the "temp" location is valid? If it is not, preview will not work. (tools -> files & folders -> preview location)
cheers
Alan
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IMPORTANT NOTE!!
DO YOU HAVE A QUESTION OR PROBLEM AND WANT QUICK HELP?
THEN PLEASE SHARE A "DEMO" PROJECT.
PLEASE READ THE FORUM RULES BEFORE YOU POST:
http://www.wysiwygwebbuilder.com/forum/viewtopic.php?f=12&t=1901
MUST READ:
http://www.wysiwygwebbuilder.com/getting_started.html
WYSIWYG Web Builder FAQ