Thomas, not sure if this was the same problem as yours but:
a recent gcc-libs upgrade caused this problem on ARCH linux
ie the matrix
1 0 0 0
0 1 0 0
0 0 1 0
0 0 0 1
became:
0x1p+0 0x0p+0 0x0p+0 0x0p+0
0x0p+0 0x1p+0 0x0p+0 0x0p+0
0x0p+0 0x0p+0 0x1p+0 0x0p+0
0x0p+0 0x0p+0 0x0p+0 0x1p+0
I traced it the culprit to gcc-libs-multilib-5.1.0-4.
Downgrading to gcc-libs-multilib-4.9.2-4 solved the issue.
-neil
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