I've just had FlightGear stackdump after about 15min of flight with the default Cessna 
in the Bay Area under gdb with the following backtrace:

(gdb) bt
#0  0x083d8936 in ssgVtxTable::draw() ()
#1  0x083c3a13 in ssgLeaf::cull(sgFrustum*, float (*) [4], int) ()
#2  0x083c10e5 in ssgBranch::cull(sgFrustum*, float (*) [4], int) ()
#3  0x083c10e5 in ssgBranch::cull(sgFrustum*, float (*) [4], int) ()
#4  0x083d1d6e in ssgRangeSelector::cull(sgFrustum*, float (*) [4], int) ()
#5  0x083d00b6 in ssgTransform::cull(sgFrustum*, float (*) [4], int) ()
#6  0x083c10e5 in ssgBranch::cull(sgFrustum*, float (*) [4], int) ()
#7  0x083c10e5 in ssgBranch::cull(sgFrustum*, float (*) [4], int) ()
#8  0x083c2226 in ssgContext::cull(ssgRoot*) ()
#9  0x083bea96 in ssgCullAndDraw(ssgRoot*) ()
#10 0x080547e6 in fgRenderFrame() () at main.cxx:651
#11 0x080560d6 in fgMainLoop () at main.cxx:1217
#12 0x4009be2e in __glutRegisterEventParser () from /usr/lib/libglut.so.3
#13 0x4009c4db in glutMainLoop () from /usr/lib/libglut.so.3
#14 0x08058323 in fgMainInit(int, char**) (argc=2, argv=0xbffffae4) at main.cxx:1706
#15 0x080527fa in main (argc=2, argv=0xbffffae4) at bootstrap.cxx:139

I'll keep it open for half an hour or so in case anyone with an idea of what's going 
on has any suggestions for variables to look at, but this seems to be repeatable 
(hence the run under gdb).

Cheers - Dave

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