Dear Colleague,

Two bugs have been found in the Dissipative Particle Dynamics (DPD) code of 
DL_MESO 2.5.

When using the DPD thermostat with the DPD Velocity Verlet (DPD-VV) integration 
algorithm, the incorrect import routines are currently being called for 
importing of recalculated dissipative forces when the system is not undergoing 
Lees-Edwards shearing. This runs the risk of the system not being thermostatted 
correctly when running in parallel. (In serial running, the import routines for 
dissipative forces with and without shear are functionally identical.)

To fix this bug, please change lines 735, 1043 and 1247 in integrate_module.f90 
(currently calling the routine importdata_dpdvv2_shear for CASE DEFAULT) to

  CALL importdata_dpdvv2 (nlimit)

to call the dissipative force import routines without shear.

When using the DPD utility molecule-generate.cpp: if a harmonic cosine angle or 
a harmonic dihedral interaction is specified, a superfluous interaction type of 
the next kind (cosine angle or harmonic cosine dihedral) with identical 
parameters is erroneously written to the FIELD file. This bug can be fixed by 
adding the following line immediately before lines 891 and 912 in molecule-
generate.cpp:

  break;

which prevents running into the instructions for the subsequent case.

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

Michael Seaton
2012-08-06