Back To My Mac: why can't I copy files between Macs?

I use Back To My Mac to connect between a Mac Book Pro and Mac Pro. These two machines have the same home directory name, but different passwords. My home network is on an Apple Airport Extreme.
A recent, persistent bug is causing havoc when I try to copy files between computers. Here is what happens:
1. I connect to the Mac Pro remotely from the MBP, using my Apple ID credentials.
2. Using a finder window on my Mac Book Pro, I try to copy a file TO the Mac Pro desktop that I'm certain doesn't already exist there. A "Preparing to copy" window appears.
3. After a few moments, a window appears: "Finder wants to make changes. Type your password to allow this." Again, I've already entered my Apple ID to connect to the Mac Pro. This window requires my Mac Book Pro sign-in in order to continue.
4. The next message is 'A newer item named “FileName.pdf” already exists in this location. Do you want to replace it with the older one you’re moving?'
Here are the results of my options from this dialog:
>>If I choose 'Keep Both Files':
-- A progress window appears (saying something like "copying 0 of 108 kb", but without any progress bar movement). I click the X button to stop the transfer, the progress window changes to "stopping" status, but remains on the screen for several minutes. My Mac Pro is unresponsive/unreachable via BTMM during this time.
-- After several minutes, the file transfer progress window disappears and my Mac Pro becomes available again via BTMM. There are now several THOUSAND numbered copies of the original. Each is 0 kb in size.
>>If I choose 'Replace':
-- A progress window appears, quickly followed by this message: 'The operation can’t be completed because an item with the name “” already exists.' The message appears exactly as written, without the filename between the quotes.
-- A file with the same name as the one I tried to copy over is now on the Mac Pro desktop, but it is 0 kb in size.
I'm lost -- not sure if this is a permissions issue, a problem w/ BTMM, or something else. Any input, advice, questions, etc. are very welcome.
Thanks

I'm having the exact same issue, did you find a solution. It's annoying!

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