I know I’m a little early, but in Fedora 29 Insync does not work. I tried the following versions:
insync-1.4.7.37098-fc25.x86_64.rpm
insync-1.5.1.37343-fc25.x86_64.rpm
insync-1.5.1.37344-fc25.x86_64.rpm
Insync seems to work, but does not synchronize anything.
Well, there are no more details…
UI starts up normal, but no synchronization happens. In the logs I provided I think the issue is comprehensible (I think something with zlib and/or GLib, perhaps because of the newer versions in F29?).