Version:  2.7.1

? K = bnfinit(x^2 - 168);
time = 2 ms.
? mod = bnrinit(K,[6,[1,1]],1);
time = 1 ms.
? bnrL1(mod)
  ***   at top-level: bnrL1(mod)
  ***                 ^----------
  *** bnrL1: bug in ArtinNumber, please report.
  ***   Break loop: type 'break' to go back to GP prompt
break> break

?
?
? K = bnfinit(x^2 - 305);
time = 1 ms.
? mod = bnrinit(K,[4,[1,1]],1);
time = 1 ms.
? bnrL1(mod)
  ***   at top-level: bnrL1(mod)
  ***                 ^----------
  *** bnrL1: bug in ArtinNumber, please report.
  ***   Break loop: type 'break' to go back to GP prompt
break> break

Here is my configuration: 

                                                                        GP/PARI CALCULATOR Version 2.7.1 (released)
                                                                i386 running darwin (x86-64/GMP-6.0.0 kernel) 64-bit version
                                                   compiled: Jul 14 2014, Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
                                                                                  threading engine: single
                                                                       (readline v6.3 enabled, extended help enabled)