Are you sure it's fixed?
Just upgraded from 4.1 to 4.2x7 and issue is still there. i found this looking at wrapper.log:
INFO | jvm 1 | 2013/05/16 18:31:17 | 2013-05-16 18:31:17,026 [VMExaminer-VIRTUAL_MACHINE-1368721876901] ERROR com.netapp.caster.server.scanmanager.VMExaminerService - Failed to examine VM
INFO | jvm 1 | 2013/05/16 18:31:17 | com.netapp.kamino.data.ZapiException: Could not initialize class com.netapp.alignment.virtualDisk.VirtualDiskInfo
INFO | jvm 1 | 2013/05/16 18:31:17 | at com.netapp.kamino.server.duplicator.VmdkFile.<init>(VmdkFile.java:295)
INFO | jvm 1 | 2013/05/16 18:31:17 | at com.netapp.caster.server.scanmanager.VMExaminerService.configureScanContextForSnapshot(VMExaminerService.java:260)
INFO | jvm 1 | 2013/05/16 18:31:17 | at com.netapp.caster.server.scanmanager.VMExaminerService.examine(VMExaminerService.java:166)
INFO | jvm 1 | 2013/05/16 18:31:17 | at com.netapp.caster.server.scanmanager.VMExaminer.run(VMExaminer.java:27)
INFO | jvm 1 | 2013/05/16 18:31:17 | at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
INFO | jvm 1 | 2013/05/16 18:31:17 | at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
INFO | jvm 1 | 2013/05/16 18:31:17 | at java.lang.Thread.run(Unknown Source)
INFO | jvm 1 | 2013/05/16 18:31:17 | 2013-05-16 18:31:17,026 [VMExaminer-lincl876.neuroinvest.net-1368721876901] INFO com.netapp.caster.server.scanmanager.VMExaminerService - Cleaning up any remaining snapshots
INFO | jvm 1 | 2013/05/16 18:31:17 | 2013-05-16 18:31:17,041 [VMExaminer-lincl876.neuroinvest.net-1368721876901] INFO com.netapp.caster.server.scanmanager.VMExaminerService - Finished scanning virtual machine: VIRTUAL_MACHINE (5230aed9-8935-f009-6bd1-d4b5e31d92e5)