LIGGGHTS 2.2.3: (released 29 November 2012)
+ Extended fix adapt so it can handle atom-style variables for particle growth/shrinkage. Also added the example "packing" that was already there in 1.5.
+ Update for region/mesh/tet with improvements regarding volume calculation.
+ Fixed an issue where unfixing a fix insert/stream command mid-simulation could lead to a crash. Thanks to Andrew Hobbs (Astec) for sending a testcase that showed this problem.
+ Fixed a bug with random generation, affecting "gaussian","lognormal", and "uniform" distributions with fix particletemplate/sphere . Thanks to David Heine (Corning Inc) for providing a testcase.
However, there are some restrictions in 2.2.3 (see below) which will be relaxed over time:
+ fix breakparticle/force is not yet available