Can't search media in Emby for Android

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So, I have previously used XBMC for a year and have been using Plex for a few months. This week I installed Emby. Server is running on Ubuntu 15.04 64 bit. Android app connects and can browse media and send to Chromecast without difficulty. Unfortunately search facility in android app doesn't seem to work at all. I get no response, no results, no progress bar or error notice whether I click on enter or on the magnifier icon. Clearly something is happening though because sometimes a previous search from several occasions ago will show up briefly when i try to do a new search and artists I have searched for get added to the live mix list. Search via web browser is almost instantaneous with results. What gives?