t/SeqFeature/Generic.t failures

[eserte]

On some of my smoker systems t/SeqFeature/Generic.t in BioPerl-1.7.8 fails like this:

#   Failed test at t/SeqFeature/Generic.t line 222.
#          got: 'ATGGCTCGCTTCGTGGTGGTAGCCCTGCTCGCGCTACTCTCTCTGTCTGGCCTGGAGGCTATCCAGCNNN'
#     expected: 'ATGGCTCGCTTCGTGGTGGTAGCCCTGCTCGCGCTACTCTCTCTGTCTGGCCTGGAGGCTATCCAGCATG'

#   Failed test at t/SeqFeature/Generic.t line 224.
#          got: 'MARFVVVALLALLSLSGLEAIQXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'
#     expected: 'MARFVVVALLALLSLSGLEAIQHAPKIQVYSRHPAENGKPNFLNCYVSGFHPSDIEVDLLKNGKKIEKVEHSDLSFSKDWSFYLLYYTEFTPNEKDEYACRVSHVTFPTPKTVKWDRTM*'
# Looks like you failed 2 tests of 364.
t/SeqFeature/Generic.t .............. 
Dubious, test returned 2 (wstat 512, 0x200)
Failed 2/364 subtests 

Unfortunately statistical analysis over test reports gives no hints about possible reasons.