Having the same issue with MIUI 3.1.11. Waiting to see if 3.1.18 can change anything. Anyways, if u want to use some other home, this way can help u come out . http://forum.xda-developers.com/showpost.php?p=39439211&postcount=306
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MIUI 3.3.22 released and it supports LT18i. If the OP is busy to take it to Arc, can someone tell me what files should i take from the 302 MB file to move it to Arc/S? Neo/V users would need the System/framework and system/app files to update their rom