Windows 10 and Dropbox

[ty]

With a .ly file in Dropbox (local file but connected to the cloud) and with the
OS Windows 10, I have never been successful in compiling it. The log stops at
"Drawing systems..." and no .pdf or .ps file appears, however long I wait.

If the OS is Windows 7, there is no problem. Also if the .ly file is outside
Dropbox, there is no problem even with Windows 10.

Has this happened to anyone else?  Is there a cure (except for abandoning 
Dropbox?)

My current Windows 10 is Pro Ver. 1703 Build 15063.483, and Dropbox is Ver.
31.4.25, but this has been happening for at least half a year and at least on
another machine with Windows 10 Home, so I don't think this is
version-dependent.