Opera 7.21 preview 2 (build 474) changelog 
(7.21 preview 2 -> 7.21 preview 1): 
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Display: 
- Crash fix (www.telefonicamovil.cl) 
- Fixed element not fixed when scrolling with mouse only when using scrollbars 

Download: 
- Let downloaded skin keep correct file extension. 

Toolbars and menus 
- Skin fix for menubar. Some skins did not work properly on startup. 

Install: 
- Fixes for tar.gz and tar.bz2 packages