I'm having the exact same issues with Lightroom!!!!  I'm getting so frustrated!  I'm using a PC with Windows 7 and using Lightroom version 4.2 64-bit.  About 2 months ago, Windows went through a large series of updates and, since then, Lightroom has been "not responding" on imports.  I have uninstalled and reinstalled the program numerous times and it will work flawlessly for a couple of days and then starts acting up again.  I'm really getting tired of it and there doesn't seem to be a solution for it...according to this messsage?!  HELP!

I'm a long time mac user. Just installed it on Win7 64 bit. Crashes to the point that nothing else will work on the box. Brand new windows machine, lots of memory. Sad.

The link above wasn't working. I was able to import, and now it just stops responding to input, not only on Lightroom, but I can't even shut windows down (I can log out is all).

I've got no hubs or anything.

I have this LR4 freezing problem. I'm just coming to the last 10 days of the trial period on Windows 8 64bit, and I was seriously considering buying it to complement PS Elements. However, in the last week, it has begun to freeze up for minutes on end when I make some mouse or keyboard input. The whole LR4 application locks solid, I can't minimize it, move it on screen, or close it. If I wait, sometimes up to 10 mins, it usually comes back to life, often only to freeze a short while later (sometimes on next mouse use). If I don't feel like waiting indefinitely, I have to kill it with Taskmaster. The rest of the computer's applications are unaffected, and neither CPU nor memory appears to be under any load (there's 12 GB RAM, so no shortage).

When this problem first started, I uninstalled LR4, cleaned the registry, and rebooted before reinstalling it. I also took ownership of my image folders. The new installation froze as I was selecting folders to import for the first time, unfroze after a couple of minutes, then froze again when I tried to look at the application settings/preferences. I don't feel inclined to risk messing up my USB devices (mouse, keyboard, touch pad, bluetooth, iPod, Android, camera, memory stick, etc.) by uninstalling my USB hubs or drivers. Adobe should be able to write software to handle such things, and multi-threading should allow the main application to run effectively regardless of such external hardware IO access.

There's no point my purchasing this application as it is, although I liked it when it was working. It would be nice to have some indication whether Adobe is working on a fix for this problem, and if so, when it is likely to be available. Otherwise, I'll spend my money elsewhere.

Hi Pete,

The problem wasn't crashing as such, but hanging unresponsive for arbitrarily long periods. If left long enough, it would recover.

The version was Lightroom 4.4.

I tried all the sensible suggestions on the knowledgebase.

However, the problem now appears to be solved.

It turns out that a rogue Intel Rapid Storage Technology (SATA) service was leaking memory, and was using up to 2GB of working RAM. My Dell PC has 12GB of RAM, so overall RAM levels didn't seem to be a problem. However, since I have replaced this rogue service with an updated version, Lightroom no longer hangs. I don't know why only Lightroom would become so totally unresponsive (I could run Photoshop Elements and other memory-hungry or memory intensive programs normally), but Lightroom does seem to be particularly sensitive to this. Maybe it needs large amounts of contiguous memory, I don't know. It may be a Windows 8 memory management peculiarity.

So my particular Lightroom problem is now resolved, and there is a useful lesson that Lightroom may suffer serious hang problems when other memory hogs are running - even if there is apparently plenty of free memory available.

So thanks for the assistance.