Remote Desktop Connection Manager 2.7

RDCMan 2.7 keeps crashing when trying to open a second session. I have this installed on a windows 10 64bit machine with 16Gb of ram and dual quad core cpu. I have read many posts with no luck of resolving my issue. Screen resolution 1920*1080.  Any help would be grateful.  I use this program every day or at least try to now.

Configuration file

<?xml version="1.0"?>
<configuration>
  <configSections>
    <section name="rdcman" type="RdcMan.Configuration.RdcManSection, RDCMan"/>
  </configSections>

  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
  </startup>
 
  <rdcman>
   
    <!-- Size options for client size and remote desktop size. Only the first ten are used. -->
    <displaySizes>
      <add size="800 x 600"/>
      <add size="1024 x 768"/>
      <add size="1280 x 1024"/>
      <add size="1366 x 768"/>
      <add size="1440 x 900"/>
      <add size="1600 x 1200"/>
      <add size="1920 x 1200"/>
    </displaySizes>

  </rdcman>
</configuration>

Craig Hollar