Newbie: Repeated browser failures Firefox, Mozilla, Konqueror, FC3 2.6.10

[Clive at Rational]

Hi,

   Running Fedora 3 and 2 on laptop. Installed ATI
proprietory drivers to try to improve stability.

   I frequently get browser (Mozilla, Firefox,
Konqueror) windows just closing. I have looked in logs
and don't see any error messages. Konqueror does
sometimes  trap the error and produces trace - see
below. I'm am very light-weight in Linux. Any meaning
from the attached? Should I post the info elsewhere?

Thanks

Clive

Using host libthread_db library
"/lib/tls/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1208297792 (LWP 5922)]
[KCrash handler]
#4  0x024088bb in QPtrStack<DOM::NodeImpl>::deleteItem
()
   from /usr/lib/libkhtml.so.4
#5  0x02408a8b in QPtrStack<DOM::NodeImpl>::deleteItem
()
   from /usr/lib/libkhtml.so.4
#6  0x0247351a in
QPtrVector<khtml::RenderLayer>::deleteItem ()
   from /usr/lib/libkhtml.so.4
#7  0x0245bfe0 in QValueVectorPrivate<QRect>::reserve
()
   from /usr/lib/libkhtml.so.4
#8  0x0245bfcc in QValueVectorPrivate<QRect>::reserve
()
   from /usr/lib/libkhtml.so.4
#9  0x0245bfcc in QValueVectorPrivate<QRect>::reserve
()
   from /usr/lib/libkhtml.so.4
#10 0x0245bfcc in QValueVectorPrivate<QRect>::reserve
()
   from /usr/lib/libkhtml.so.4
#11 0x0245bfcc in QValueVectorPrivate<QRect>::reserve
()
   from /usr/lib/libkhtml.so.4
#12 0x0245bfcc in QValueVectorPrivate<QRect>::reserve
()
   from /usr/lib/libkhtml.so.4
#13 0x0245bfcc in QValueVectorPrivate<QRect>::reserve
()
   from /usr/lib/libkhtml.so.4
#14 0x0245bfcc in QValueVectorPrivate<QRect>::reserve
()
   from /usr/lib/libkhtml.so.4
#15 0x0245bfcc in QValueVectorPrivate<QRect>::reserve
()
   from /usr/lib/libkhtml.so.4
#16 0x0245bfcc in QValueVectorPrivate<QRect>::reserve
()
   from /usr/lib/libkhtml.so.4
#17 0x0245bfcc in QValueVectorPrivate<QRect>::reserve
()
   from /usr/lib/libkhtml.so.4
#18 0x0245bfcc in QValueVectorPrivate<QRect>::reserve
()
   from /usr/lib/libkhtml.so.4
#19 0x0248d35f in non-virtual thunk to
khtml::RenderSelect::~RenderSelect() ()
   from /usr/lib/libkhtml.so.4
#20 0x08d10188 in ?? ()
#21 0x00000000 in ?? ()