Clicking the mute button from a dialog when receiving a landmark or a notecard (spam) will crash the viewer if there are pending notifications behind the dialog, at login for instance, and then all those pending notifications are lost.
the whole notification system is awkward in case of a crash at login, i don't understand why notification are not marked unread till at least one button in the notification window is clicked, it would be so much simpler.
Till better handling of notifications, at least fix the mute button in those blue dialogs when a LM or notecard is received, to reduce the loss of those messages pending behind it as one might be important and they have been sent while the user was offline, so no way to guess who or what group to read it after relogging from the crash.
A design change to the way notifications are handled is here VWR-4832 Notifications and Alerts redesign and specifically VWR-6495 Re-show group messages after crash. The VWR-9173 "Next Dialog" arrows too close to Mute button on Default skin could be related to your issue. Please add your comments and vote to those issues.
Re crashing, your OpenGL is a little out-of-date, please check you have the latest graphics drivers by either going to your manufacturer's site or by checking here
Knowledge Base > Second Life Info > Solution Finder > Technical Issue > How do I get the latest drivers for my graphics card? Topic #: 4051-3884
http://secondlife.com/support/?questionID=3884
If you still have this issue please run the DirectX Diagnostic Tool
XP: Click on the Start button and select Run. In the Open text box. Enter "dxdiag" and click OK > Save All Information.
Please attach the text file to this issue.
Knowledge Base > Second Life Info > Solution Finder > Technical Issue > What is a graphics card? Will mine work with Second Life? How do I tell which one I have? Topic #: 4051-3886
http://secondlife.com/support/?questionID=3886
After you have crashed, before you restart Second Life please attach your latest SecondLife log and crash report to this issue
Knowledge Base > Second Life Info > Solution Finder > Technical Issue > Where do I find my Second Life diagnostic logs? Topic #: 4051-4209
http://secondlife.com/support/?questionID=4209
Thank you
Resolving back to OP for further comment re JIRA guidelines http://wiki.secondlife.com/wiki/Issue_tracker