Dear Colleague,

A bug has been discovered in the Dissipative Particle Dynamics (DPD) code of 
DL_MESO 2.5.

When reading CONFIG files containing molecules, incorrect indices are calculated 
for arrays used to assign global particle numbers to the particles in each 
molecule. Some Fortran90 compilers will correctly report an error in array 
bounds or a segmentation fault when the code is run, but others may assign 
nonsensical numbers for particles in molecules. This may have an effect on 
bonded interactions, as the global particle numbers are used to identify the 
particles involved, and there may also be issues with visualisation. (This does 
not affect simulations that are initialised from scratch.)

To fix the above problem, change lines 1403-1404 in start_module.f90 to:

  gb = nusyst + (i - molstart (imol)) + nfold * (molstart (imol) - nusystcell) + &
        &(ifx + nfoldx * (ify + nfoldy * ifz)) * (molstart(imol+1) - molstart(imol))

We strongly recommend that all registered users should either make the code 
change 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
2014-12-09