Dear Colleague,

A bug has been spotted in the Dissipative Particle Dynamics (DPD) code of 
DL_MESO version 2.6.

When running the DPD code in parallel, MPI communications for creating the 
boundary halo used for local density calculations in many-body DPD are currently 
not being synchronised properly. This can cause the particle data sent between 
processors to be transferred incorrectly and result in unexpected errors during 
calculations of local densities, particularly due to incorrect determination of 
particle species. (Many thanks are due to Maria Panoukidou at the University of 
Manchester for bringing this bug to our attention.)

To fix this bug, an additional line in the exportdensity subroutine of 
domain_module.f90 needs to be included. The following line should be inserted 
immediately before line 3076 of domain_module.f90 (the line containing the 
NULLIFY statement):

  CALL msg_wait (iput)

Please note that no corrections are necessary for the serial version of the 
code.

We strongly recommend that all registered users of DL_MESO version 2.6 should 
either make the above code change or re-download the package using the 
instructions received on registration to get the corrected version of the 
software. Re-registration is not required and the same password is used for 
decryption.

Michael Seaton
2017-01-24