In the latest in a string of defections since company founder and CEO Charles Smith's conviction for failing to pay payroll taxes, real estate showing appointment company eShowings has lost its biggest client, the North Carolina-based Wilmington Regional Association of Realtors. Newark, Del.-based eShowings recently reopened its two call centers under the leadership of Smith's wife, Catherine Lanouette Smith, following an unexpected shutdown on Dec. 9, just days after Charles Smith reported to prison to begin serving a 2 1/2-year sentence. Since Charles Smith pleaded guilty in April to 10 counts of failing to truthfully account for and hand over payroll taxes to the government during a nearly three-year period between 2007 and 2009, eShowings has lost several large clients, includin...