outofflowmgr.cc:1527: Assertion `yReq >= 0' failed.

outofflowmgr.cc:1527: void dw::OutOfFlowMgr::tellFloatPosition(dw::core::Widget*, int): Assertion `yReq >= 0' failed.

At http://darwinday.org/events/

#0  0xb775e424 in __kernel_vsyscall ()
#1  0xb7083661 in *__GI_raise (sig=6)
    at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#2  0xb7086a92 in *__GI_abort () at abort.c:92
#3  0xb707c878 in *__GI___assert_fail (assertion=0x8158124 "yReq >= 0", 
    file=0x8158073 "outofflowmgr.cc", line=1527, 
    function=0x81584a0 "void dw::OutOfFlowMgr::tellFloatPosition(dw::core::Widget*, int)") at assert.c:81
#4  0x080b8016 in dw::OutOfFlowMgr::tellFloatPosition (this=0x844f5b0, widget=
    0x8cda630, yReq=-1348746332) at outofflowmgr.cc:1527
#5  0x080b7fdd in dw::OutOfFlowMgr::tellPosition (this=0x844f5b0, 
    widget=0x8cda630, yReq=-1348746332) at outofflowmgr.cc:1516
#6  0x080aed85 in dw::Textblock::wrapWordInFlow (this=0x844ed10, wordIndex=9, 
    wrapAll=true) at textblock_linebreaking.cc:788
#7  0x080ae8c0 in dw::Textblock::wordWrap (this=0x844ed10, wordIndex=9, 
    wrapAll=true) at textblock_linebreaking.cc:606
#8  0x080b1842 in dw::Textblock::showMissingLines (this=0x844ed10)
    at textblock_linebreaking.cc:2113
#9  0x080a431d in dw::Textblock::sizeRequestImpl (this=0x844ed10, 
    requisition=0xbfeaa950) at textblock.cc:342
#10 0x080dafc0 in dw::core::Widget::sizeRequest (this=0x844ed10, 
    requisition=0xbfeaa950) at widget.cc:494
#11 0x080b71c7 in dw::OutOfFlowMgr::doFloatsExceedCB (this=0x844f5b0, 
    side=dw::OutOfFlowMgr::LEFT) at outofflowmgr.cc:1045
#12 0x080b67ae in dw::OutOfFlowMgr::sizeAllocateEnd (this=0x844f5b0, 
    caller=0x844ed10) at outofflowmgr.cc:651
#13 0x080a4e6b in dw::Textblock::sizeAllocateImpl (this=0x844ed10, 
    allocation=0xbfeaab00) at textblock.cc:759
#14 0x080dbe93 in dw::core::Widget::sizeAllocate (this=0x844ed10, 
    allocation=0xbfeaab00) at widget.cc:993
#15 0x080a4d8d in dw::Textblock::sizeAllocateImpl (this=0x8468b58, 
    allocation=0xbfeaabf0) at textblock.cc:744
#16 0x080dbe93 in dw::core::Widget::sizeAllocate (this=0x8468b58, 
    allocation=0xbfeaabf0) at widget.cc:993
#17 0x080a4d8d in dw::Textblock::sizeAllocateImpl (this=0x8468278, 
    allocation=0xbfeaace0) at textblock.cc:744
#18 0x080dbe93 in dw::core::Widget::sizeAllocate (this=0x8468278, 
    allocation=0xbfeaace0) at widget.cc:993
#19 0x080a4d8d in dw::Textblock::sizeAllocateImpl (this=0x89c7ed8, 
    allocation=0xbfeaadd0) at textblock.cc:744
#20 0x080dbe93 in dw::core::Widget::sizeAllocate (this=0x89c7ed8, 
    allocation=0xbfeaadd0) at widget.cc:993
#21 0x080a4d8d in dw::Textblock::sizeAllocateImpl (this=0x8a04228, 
    allocation=0xbfeaaeb0) at textblock.cc:744
#22 0x080dbe93 in dw::core::Widget::sizeAllocate (this=0x8a04228, 
#23 0x080d0230 in dw::core::Layout::resizeIdle (this=0x83a3688)
    at layout.cc:912
#24 0x080be150 in dw::fltk::FltkPlatform::generalIdle (this=0x83946e0)
    at fltkplatform.cc:630
#25 0x080be0d8 in dw::fltk::FltkPlatform::generalStaticIdle (data=0x83946e0)
    at fltkplatform.cc:620
#26 0x08106e5c in call_idle() ()
#27 0x080e3eb5 in Fl::wait(double) ()
#28 0x080e3ff5 in Fl::run() ()
#29 0x08053b6f in main (argc=2, argv=0xbfeab0d4) at dillo.cc:590