Windows Installer Package Sometimes Installs Corrupt Log4net.dll

I have a really simple MSI that installs a bunch of files and then creates and starts a service. One of the files it installs ( privately to the installdir ) is log4net.dll and is a dependency of the service.

I'm getting bug reports from dev that occasionally the service won't start. The root cause is that the log4net.dll is corrupted. It's the right size but it's hash is wrong and an examination of the file reveals that it's all NUL characters.

It's not a build problem because other people can take this exact MSI and install it on different machines and/or uninstall / reinstall the broken machine and the right log4net.dll get'开发者_如何转开发s installed.

Has anyone ever heard of anything like this?