I have been working on a new Wordpress theme for this site and have noticed on several occasions that Wordpress has reverted back to the default theme.

Google turned up a few helpful pages:

• Wordpress Theme Resetting Problem posted by Scott Burkett
• Wordpress defect #3907

The problem boiled down to the fact that I was editing the file remotely via SFTP. If I happened to save the file at same time as someone was trying to access a page it the file exists check would fail as there is always a split second while the file is being saved that it technically doesn’t exist. The code suggested in the bug report above worked well for me.

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