An error occurred while loading the project. The ip address set for the local Web Server preview is incorrect" 
Autor: Mark Nicholas
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Hi, I am having the same problem. Recommended solutions do not work at all.
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Further to my previous post I uninstalled X5 and deleted the entire Website X5v15 - Professional folder rather than just the config file (which didn't work). After re-installing X5 the problem went away.
Hope this helps others with the same problem.
Thanks Mark!
You must edit que XML and mark it as a "read only", than way it will not be changed by this bug.