Disk Images refuse to mount help!

DiskImageMounter seems unable to open any disk images and Disk Utility also has problems opening them Ihave to try three or four times to open them (this is diskimages from any source). What could be causing this? Any suggestions would be welcome, as I have had this probelm since 10.4.3

Create a new account, name it "test" and see if .dmg open correctly in that User acct? (That will tell if your problem is systemwide or limited to your User acct.) This account is just for test, do nothing further with it.
Open System Preferences >> Accounts >> "+" make it an admin account.
If the test account functions normally log back into your regular user account. Then navigate to ~(yourhome)/library/preferences and delete these 3 files:
com.apple.frameworks.diskimages.diskimagesuiagent.plist
com.apple.frameworks.diskimages.plist
com.apple.frameworks.diskimages.uiagent.plist
Then log out and back in or restart. Let us know.
-mj
[email protected]

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