I'm using Konqueror 4.6 RC1 on a laptop with ATI Mobility Radeon HD 5470. If I visit a webpage
http://www.nokiaphones.net/beginning-nokia-apps-development-using-meego-mobile-qt-and-opensymbian/
and sroll some time on it it crashes whitg this backtrace in gdb:

Program received signal SIGSEGV, Segmentation fault.
0x00007fae15ab54be in EVERGREENAppendCopyVertex (pScrn=<value optimized out>, srcX=214, srcY=103, dstX=<value optimized out>, dstY=<value optimized out>, 
    w=<value optimized out>, h=5) at evergreen_exa.c:541
541     evergreen_exa.c: No such file or directory.
        in evergreen_exa.c
(gdb) where
#0  0x00007fae15ab54be in EVERGREENAppendCopyVertex (pScrn=<value optimized out>, srcX=214, srcY=103, dstX=<value optimized out>, 
    dstY=<value optimized out>, w=<value optimized out>, h=5) at evergreen_exa.c:541
#1  0x00007fae15ab722c in EVERGREENDownloadFromScreen (pSrc=0x1fdbff0, x=214, y=103, w=5, h=5, dst=0x2141e50 "EIP", dst_pitch=5464) at evergreen_exa.c:1721
#2  0x00007fae153b131f in exaCopyDirty (migrate=<value optimized out>, pValidDst=0x1fdc088, pValidSrc=0x1fdc098, 
    transfer=0x7fae15ab6e60 <EVERGREENDownloadFromScreen>, fallback_index=1, sync=0x7fae153afbc0 <exaWaitSync>) at exa_migration_classic.c:220
#3  0x00007fae153b3cb8 in exaPrepareAccessReg_mixed (pPixmap=0x1fdbff0, index=0, pReg=0x0) at exa_migration_mixed.c:254
#4  0x00007fae153bdd9a in ExaCheckPolyArc (pDrawable=0x1fdbff0, pGC=0x269b930, narcs=<value optimized out>, pArcs=<value optimized out>)
    at exa_unaccel.c:295
#5  0x00000000004d85a1 in damagePolyArc (pDrawable=0x1fdbff0, pGC=0x269b930, nArcs=1, pArcs=<value optimized out>) at damage.c:1302
#6  0x000000000042cd6f in ProcPolyArc (client=<value optimized out>) at dispatch.c:1817
#7  0x0000000000430529 in Dispatch () at dispatch.c:432
#8  0x00000000004249ed in main (argc=10, argv=<value optimized out>, envp=<value optimized out>) at main.c:291

Before the crash happens I see some rendering glitches on the page, Like text shown stranegly and black boxes where text should be.
I tried this 3 times and I got the crash in all three cases. I have KDE desktop effects disabled when this happens.