Hi 2.5.0 and 2.5.1 cause endless sync for me on Mac (MacBook Pro and iMac) with NC server 14.0.4
Also it shows the unresolved conflicts icon in the tray in exchange with the sync icon.
And it consumes 100% CPU and often hangs and needed to be killed.
After rolling back to 2.3.3 I have a working client back with less than 10% cpu usage. Don’t know what you guys have done but the 2.5.x versions are far away from production maturity and I am pretty much astonished that they have been published.