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If you have this crash problem after one day of opera mini beta for windows phone, don't uninstall it. Because a new install of the same Version increase the problem.
Opera mini will not start anymore, it will crashes in a few seconds. So you can not use this tip.
Nokia Lumia 920
OS 8.10.12393.890
Opera Mini - beta 0.9.0.3
Opera Mini beta is really instable today, it crashes if you enter a web address or use a favorite.
Nokia Lumia 920
OS 8.10.12393.890
Opera Mini - beta 0.9.0.1
Opera Mini beta crashes after start.