Symptoms: Your Skype crashes on incoming chat message or if you try to open a contact info / chat message – usually this leads to a crash on Skype start-up because there are always incoming chat messages in a queue.
Skype is not really helpful regarding how to get meaningful log information from the client, but it is possible.
Create a log directory
Run Skype from the command line and open a chat window so that it crashes
moo@murskaamo:~$ skype Aborted
Now there should be log data available
moo@murskaamo:~$ ls -lh ~/.Skype/Logs/ total 724K -rw-r--r-- 1 moo moo 607K 2010-07-16 11:10 skype_20100716-1110.log -rw-r--r-- 1 moo moo 116K 2010-07-16 11:10 skype_20100716-1110.trace.txt
However, those log files are little useful for anybody except Skype developers as they are encrypted. Your only hope is to submit them to a Skype bug tracker and hope that someone answers you something meaningful. The guidelines how to create a bug report and how they are processed is little unclear – there doesn’t seem to be clear announcement from Skype whether they process these reports or not.
The crashes probably are due to incompatible system library versions / bugs in them. Try downloading static Skype versions which does not use system libraries.