Earlier versions of opera still run fine. Per the screenshot, many sites have some or most of the text in an unknown italic font. I've tried commenting out lines in xorg.conf; searching the web; setting opera settings in aboutpera and in Preferences etc; ... slight chance someone else has encountered something similar, recognizes the font, or knows of a font-preview program which would help discover locally what font it is, or what file X11-related which may be setting it somewhere. On the bright side, I ran across the problem a while back, and reverted; this time, however there are two interim fixes, on pages which show the font one can 1) set author mode > user mode which may fix it depending upon how each is configured (that has a "manage modes" GUI), or more conveniently, setting the page magnification 230 percent, which happily makes the font more readable (just discovered that a few minutes ago.)