Dear @andrea_russomando and @horvathd,
I had a look and it seems that due to a hick-up during the merging of different development branches the original patch which had fixed the bug addressed in Geoviewer tab-Segmentation fault, did not make it into this release.
One solution is indeed to compile with THREAD=no but in that case you will lose quite a bit of performance. Therefore, I suggest to replace the file d3layer.cc in the sub-directory viewer of the geoeditor with this version (compatible with FLAIR 3.1-4a)
d3layer.cc (38.8 KB)
and recompile with
make clean
make
make install
Sorry for the trouble.
Cheers
Chris