Wonder if anybody else has had this happen, a couple times i go to push my messaging icon and a different app opens, close it and try again same app opens. each time it has happen its a separate app,If i push the back button it just cycles through prev. apps. Hope that makes sense I either restart my phone or go into contacts and press the text icon next to a contact to get back into my text messages.
Stock Galaxy Nexus
Stock Galaxy Nexus