RomanZ, To clarify, I am not receiving any errors from excel in 1.4.103. I was having excel errors in BTsync versions prior to 1.4.103. It appears the errors that I am receiving in 1.4.103, are from the BTsync GUI (see screenshot in previous post). After following suggestion from colinabroad, it appears to be an issue in the GUI only, as I can confirm files are correctly syncing for me the last few days. I can also confirm that a simple close/reopen of the GUI clears the error, and I do not have to actually close the BTsync application.