updated 04:35 pm EST, Thu February 25, 2010
The current beta build lacks support for PowerPC-based Macs, while OS X 10.4 users might experience performance issues. The software is also said to have minimal Java support and unresolved problems with the widget keyboard and windows.
Opera 10.5 beta is now available as a free download. The company has yet to announce a release date for the final version.