This got for me to the point that I always don't get any results in Dash Home after opening it. Fortunately there is a workaround in my case. If I open the applications lens directly with shortcut (Super + A) or with quicklist it gets results and then the Dash Home starts working.
I'm now on fully updated Vivid which was upgraded directly from Trusty (sudo sed -i 's/trusty/vivid/g' /etc/apt/sources.list).
This got for me to the point that I always don't get any results in Dash Home after opening it. Fortunately there is a workaround in my case. If I open the applications lens directly with shortcut (Super + A) or with quicklist it gets results and then the Dash Home starts working.
I'm now on fully updated Vivid which was upgraded directly from Trusty (sudo sed -i 's/trusty/vivid/g' /etc/apt/ sources. list).