WordPress Mobile Pack in Opera Mobile (top) versus WebKit-based mobile phones (bottom)
There’s a minor incomaptibility between WordPress Mobile Pack and Opera Mobile. Opera Mobile is served a slightly pared-down version of the site (top), without gradients or a toggle-able comments section. WebKit-based browsers do.
If you’d like to support Opera Mobile or Opera Mini users, the following seems to do the trick.
Open wp-content/themes/mobile_pack_base/group_detection.php and within the group_detection() function, change:
if (
strpos($user_agent, 'series60') !== false ||
strpos($user_agent, 'maemo') !== false ||
strpos($user_agent, 'webkit') !== false
)to:
if (
strpos($user_agent, 'series60') !== false ||
strpos($user_agent, 'maemo') !== false ||
strpos($user_agent, 'webkit') !== false ||
strpos($user_agent, 'opera mobi') !== false
).
Keep in mind that if you do this, future upgrades to the plugin will wipe out your changes. But you should be backing up your plugins before upgrading them anyway 
.