Currently we have a scenario where there is a CD release (A), a middle patch (B) and a patch about to go out (C).
Installing (A) and patching directly to (C) works fine, but when the user patches up to (B) and then up to (C), they get error 2920 during the "Copying new files" action (first file in the sequence).
What's interesting is this issue doesn't occur on Windows 7, but occurs on Win2K3 and XP, which suggests to me that the different versions of Windows Installer are handling this scenario differently.
The current patch implementation creates admin installs, Prepares WiX source files for the MSP, creates the PCP file, then creates/signs the MSP file.
I've looked all over there hasn't been a determined cause/solution.
Thanks for your time.