So I used to have an 8300. Actually, I had 3 because I kept breaking them. Anyway, on one of them I loaded in opre mini v. 3 and hated it. But after reading on this site the past few days how much you all seemed to like it, I put v.4 on my 8310. It ate it!!! I couldn't do a damn thing on my phone - the hourglass was coming up every 15 seconds, I could barely use the pre-loaded browser anymore, and OM wasn't pulling sites up correctly!! I managed to use it to google from the train how to delete applications, and am glad to say its now gone.
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I did the same thing - downloaded it OTA yesterday and then had tons of problems! This morning it wouldn't even work. Now all of a sudden it does work, but all my internet was out for several hours. I don't know if it's *me* or the operamini.