New version of selection bevel released. Bugs of the last version have been fixed, and additionally a new feature added: now you can adjust the width and height of the bevel independently, creating neat effects where the bevel is thinner on some edges, or uneven.
v2.3 - Another update, at a short interval. This update has improved shape curves and gloss algorithms. The gloss setting no longer makes the "unbeveled" parts of the bevel darker, and the shape curves should look more natural now. Note that the shape curve setting now has a smaller scale, from -64 to 64, so you'll want to find new values that work for you.
I've also removed deprecated functions for futureproofing. The sad news is, that this means the future versions of this plugin no longer works for 2.6, but I'm re-enabling the download of an older version for those who still are forced to use that ancient version of GIMP... ;)
So: v1.53 is only for legacy versions - it should work in 2.6 and possibly older versions of GIMP.
edit: I've enabled the download of v2.2 again - if v1.53 doesn't work for some reason, try v2.2 - it might work in 2.6, or it might not...
If you're on an up-to-date version (2.8 or higher), use v2.3.