Some possibilities that i have run into in the past: Are all of the pc's the same OS version? Do any of them have policies in place that might prohibit your copying/renaming/changing file attributes of files? Or user rights, etc...Security (ESPECIALLY C2 patches/settings) patches installed?, etc.
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"When the debate is lost, slander becomes the tool of the loser." - Socrates
Vita contingit, Vive cum eo. (Life Happens, Live With it.)
"Life is not measured by the number of breaths we take, but by the moments that take our breath away." -- author unknown
"De omnibus dubitandum"