Upgrade to v7 causes gauges to loose threshold values

Grafana server is W2K16. I upgraded from 6.5.2 to 6.7.3 some time ago just by copying the executable into the bin folder and restarting Grafana server, everything works great. Tried this method with v7-beta3 and I lost all my thresholds I have set for gauges.
I then tried extracting the zip file for v7-beta3 into the current running 6.7.3 folder and got the same results. No thresholds in gauges.
Have I missed something somewhere?