XenApp 6.5 IMA service fails to start

On the build of a new XenApp 6.5 farm the IMA service failed to start on the first server build. The only error in event log was


System Error : The program can't start because ctxsecureima64.dll is missing from your computer.The IMA service showed in the starting state.


 However after about 10 minutes the service did finally start. A CTX article explains that the IMA has a default timeout of 6 minutes so a slow database might have been the cause of this and the DLL error message a red herring.