Up until recently, I used BOIC exclusively. A couple of months ago, I switched to Science United. Since switching, I seems to have disconnected from World Community Grid (WCG), and no longer receive projects from them. Can you explain why I no longer receing project from them and what I must do to reattach to them? Thanks.

Science United does tend to take over your ability do work for the projects you choose.
Three things
First I'm not sure if WCG is "registered" with Science United as a project, in which case you won't get any work from WCG.
Second, WCG is a compendium of projects covering a wide range of subject areas including medical, environmental work - if possible you need to make sure you have these subject areas in order to get work from WCG.
Third I think Science United gives you a new cross project identifier which may lead to you loosing your existing WCG history.

Solution:
Delete Science Untied and re-install BOINC - it can be a bit difficult to find the link to get the current version of BOINC so here's the link to the BOINC download page https://boinc.berkeley.edu/download.php. You may have to reconnect to WCG (and any other projects you were historically connected to).

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