This bug is also affecting me.  Reproducible: always, simply create a
new file and select Insert->Float->Figure.  LyX will relaunch and
recover with the float inserted (and is happy to copy and paste an
existing float), so it seems to directly related to the GUI action.

Attached the first 24 stack frames from GDB backtrace.  Also valgrind
reports this:

==6244== Invalid read of size 4
==6244==    at 0x819C641: lyx::TextMetrics::cursorY(lyx::CursorSlice const&, 
bool) const (TextMetrics.cpp:1776)

Seems like an array out of bounds or uninitialized memory bug.


** Attachment added: "backtrace.txt"
   http://launchpadlibrarian.net/44998076/backtrace.txt

-- 
lyx crashes with SIGSEGV signal caught
https://bugs.launchpad.net/bugs/541787
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