This is a change in the MSBuild actions in very recent builds of WiX.
Instead of creating a new process it now loads the assembly in-process.
It looks like light.exe can't actually handle that - that various static
variables aren't being cleared down between sessions.
Unfortunately to
Mike,
Thanks for the info! I actually found a bug registered January 22nd that looks
to be the same issue ([ 1877424 ] LGHT0001: Duplicate Key added) although a
different key. That bug report states that the 3.0.3526 release does not have
this problem so I downgraded to that release and now it
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