Upgrade from 1.5.0p23 to 1.6.x - questions

Hello checmk members,

I’ve installed a new server for upgrade testing purpose. Our prod environment is 1.5.0.p21. I restored data from the production server on the test machine, then I upgraded to 1.6.0.p9 version and I started to test some functions.
What I saw after upgrade:
if i delete a host from Hosts it is still persistent in the main dashboard.
also, for some equipments i saw only a empty graph, but in the right side at perf-o-meter column it shows correctly.

Update: both problems were solved after reboot server.

thanks,
Robert