PBEM glitches, anyone?

[FM WarB]

Here's a glitch, which neither I nor my opponent can figure out.
His move 14 does not allow me to view battle replay. He resends the same file, and all seems ok. We get to my move 16 which he cannot view, and it causes him not to be able to move his own units, even if he chooses not to view replay.
He is on Vista with new computer, I am on XP. We have had similar problems twice in the past before Vista. This time it is Campaign Waterloo, then it was El Alamein.