A minor bug has been detected in the interior-point solver: if the problem is scaled, dual solution components are computed incorrectly.
To fix the bug please replace line 445 (file glpapi08.c):
temp = lpx_get_obj_coef(lp, k) / sjj;
by the following line:
temp = lpx_get_obj_coef(lp, k) * sjj;
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