strange raster calculator behavior in QGIS

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I used to work with qgis 2.8.1 in Lubuntu and in windows7.

Each time I try to multiplicate a map for a number comprise between 0 and 1 (i.e. 0.1) I get a good results on windows OS, but I get a map with only 0 and NaN on Linux.

Further, I get a correct result on Lubuntu if I divide by 10 instead of multiplicate by 0.1.

Conclusion

"band@map" * 0.1 on windows = OK"band@map" * 0.1 on lubuntu = only 0 and NaN"band@map" / 10 on lubuntu = ok.

I use the same gdal version and I always get a correct Float32 map.

Canyou help me?

Thanx



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