There are addons for GRASS 6.x (addons) and there are others for GRASS 7 (addons)

Since the future version 7 (still being developed) marks a major break with the 6.x versions (new vector API, etc.) it is doubtful that all GRASS 6.x addons works without problems (there is no r.roughness in GRASS 7 raster addons)

So, if you want to use r.roughness without bugs or problems, use the 6.4.x version (I have no problem with the official stable version (6.4.2) and with the future version (6.4.3RC3)

There are addons for GRASS 6.x (addons) and there are others for GRASS 7 (addons)

Since the future version 7 (still being developed with several versions per month, which do you use ?) marks a major break with the 6.x versions (new vector API, etc.) it is doubtful that all GRASS 6.x addons works without problems (there is no r.roughness in GRASS 7 raster addons)

So, if you want to use r.roughness without bugs or problems, use the 6.4.x version (I have no problem with the official stable version (6.4.2) and with the future version (6.4.3RC3)

There are addons for GRASS 6.x (addons) and there are others for GRASS 7 (addons)

Since the future version 7 (still being developed) marks a major break with the 6.x versions (new vector API, etc.) it is doubtful that all GRASS 6.x addons works without problems (there is no r.roughness in GRASS 7 raster addons)

So, if you want to use r.roughness without bugs or problems, use the 6.4.x version

There are addons for GRASS 6.x (addons) and there are others for GRASS 7 (addons)

Since the future version 7 (still being developed) marks a major break with the 6.x versions (new vector API, etc.) it is doubtful that all GRASS 6.x addons works without problems (there is no r.roughness in GRASS 7 raster addons)

So, if you want to use r.roughness without bugs or problems, use the 6.4.x version (I have no problem with the official stable version (6.4.2) and with the future version (6.4.3RC3)