I have seen this bug in Ubuntu utopic too.
As a work around, you can enable the option "Show floating icon when Onboard is hidden" in the General tab of the Onboard Preferences window. This way, you can make Onboard reappear by clicking on the floating icon.
I have seen this bug in Ubuntu utopic too.
As a work around, you can enable the option "Show floating icon when Onboard is hidden" in the General tab of the Onboard Preferences window. This way, you can make Onboard reappear by clicking on the floating icon.