Lightroom 3 freezes at startup

I have Lightroom 3 on an IMAC with 4 GB memory.
Up to a few days ago it was working properly.
A few days ago someone disconnected a photo flash card while it was loading into Lightroom. I suppose that might have caused the trouble because since then I cannot start Lightroom 3 anymore it just freezes at startup.
I deleted com.adobe.Lightroom3.plist as was recommended by the Lightroom support site but this does not help.
What can I do?
Thanks for any help

I had the same problem on a MacBook Pro, 4GB, OS X 10.6.8, Lightroom 3.4.1.  Specifically, Lightroom would freeze (spinning beach ball) on the opening screen.
One solution was a reboot, and I did this several times in the past.
Interesting. I'd be curious if anybody who starts seeing this with 3.5 finds it to also be related to the MassCameraStorage process or if the hangs are distinct. The symptoms sure sound right in line.
Following up on the suggestions in this thread, I did started Lightroom from the Terminal with the traceback flag.  The only output was,
2011-08-26 11:57:40.596 Adobe Lightroom 3[9398:903] Enabling noisy tracebacks.
Well that cofirms your hang isn't caused by a thrown exception in Lua. It was a long shot, so I'm not too disappointed. Thanks for running that experiment!
Looking at the Activity Monitor, the process with the highest CPU usage by far was "MassCameraStorage", with 80%+ CPU usage.  I killed that process, and Lightroom remained frozen.  However, when I restarted Lightroom, it started up OK.
I'd be curious if others run into this MassCameraStorage process. I don't see any processes by that name on my system, but I also don't have any cameras plugged in, either. I've seen a number of hangs (usually during card/camera imports) reported related to image capture. Do you know where it comes from? (an Apple component or perhaps something specific to a particular camera manufacturer). It'd be interesting to see the contents of the "Open Files and Ports" tab of the panel that comes up when clicking on the "Inspect" button in Activity Monitor. Unfortunately, it looks like that tab is only available for processing running with your logged in user's privileges and that one might be a system process.
Anyway, it sounds like maybe LR is tangling with some other process when accessing attached USB devices (devices are enumerated  in LR to determine the enabled states of import commands and "mass storage" would include hard drives, card readers, some cameras, etc). That may be useful information for others that see the hang to provide to see if there's a pattern to attached devices among the bug's victims.
It may also suggest an API we're using on the main thread (so slow response blocks startup) that we should be more cautious about.
Thanks -- DT

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