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Actually it is a task killer abnormally terminating the music app that causes this to happen - put the music app in the task killers exclude list to stop this occurring.I've had this problem too. I can fix it by either using a task killer to kill the music process, or restarting the phone!
If you exit the music app normally I can't see how this can happen - this has been discussed before like here: http://androidforums.com/htc-hero/26251-lock-screen-now-my-last-played-track.html If you do a search I'm sure you will find more threads as well.Not in my case it wasn't!
Not in my case it wasn't!
...putting music app in ignore list worked for me 
Did you find the cause? Was it a one-off? I'm still wary because you say you used a task killer to solve it, confirming you had one installed at the time - it may have killed the music app inadvertantly. I've never heard of any other cause of this problem so would be interested in another explanation?When I used the default music app (instead of mixzing), i didn't use a task killer -_-
Did you find the cause? Was it a one-off? I'm still wary because you say you used a task killer to solve it, confirming you had one installed at the time - it may have killed the music app inadvertantly. I've never heard of any other cause of this problem so would be interested in another explanation?
You miss my point - I'm agreeing with you - it was lekky who said he used the task killer to resolve it.You Dont need a task killer to resolve this, the task killer is the problem. If you use a task killer you must put the music app in the ignore list otherwise this is what happens.
Try using the default music app and then terminate it while it is playing using your task killer (rather than just exiting) and I bet you will have the corrupted lockscreen.well i stopped using the default player, later on i tried killing it with a task killer and it worked -_-.
Not everytime, but it did it occasionally.