Hi, I've managed to get a gdb backtrace from the opera crash (attached). The opera package actually installs a script in /usr/bin/opera which runs the real binary after setting up some environment variables; in the attached output log, I have modified /usr/bin/opera to run gdb instead so that I can capture the backtrace. Unfortunately, the output is not very helpful. Judging from the values of the backtrace, it looks like some kind of stack corruption has happened, producing garbage values on the call stack. Beyond that, it's hard to narrow down the problem. I don't have debugging symbols for libx11-6, but I doubt it would've helped here.
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