I initially had some activation problems myself, but it's been solid for me since I got it working. In terms of settings, I definitely had to be in host mode since I'm not running a license server. However, since I unsuccessfully tried to activate first in bridge mode, I had to reset my license with Xeoma. You can do so here:
http://felenasoft.com/xeoma/en/support/activation-issues/license-reset/