Ahmed, Rolf,
Just wanted to follow up on an issue you flagged over a year ago with respect to using order 7 with PPPM (issue #1). Just wanted to confirm that changing that ifact variable to a LAMMPS bigint does indeed make the problem go away as you pointed out, so I changed the code in the repository for PPPM and PPPM_old accordingly. We resolved the units issue (#2) that you pointed out right away, but somehow let the order 7 issue slip. Both have been remedied now. Thanks for flagging these issues.
Paul