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Is this Wing Pro or Wing Personal? If Wing Personal, it may be that it writes to the *.wpu if you've opened a shared project created by Wing Pro but then does not read from the *.wpu because Wing Personal doesn't support shared project files. It should really complain in this case, if this is the problem. If that's not it, the ide.log file in the Settings Directory listed in Wing's About box may show what is failing. You can send that to email@example.com if you want us to look at it.