Lightroom: can't open catalogue because already opened in different App...

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  • Updated 3 months ago
Hi,
within the last 2 weeks LR Classic (cloud version) developed following problem: wenn I tried to open, it refused and warning appeared: Lightroom catalogue can't open, because it's has already been opened in a different Application. The instructions offered in "help" didn't help, and so I had du start a new catalogue, which took more than half a day with my archive of around 170 000 pictures. LR-help suggested to delete the "lock" file in the catalogue's directory, but that didn't help either, and a few days later I was facing the same problem. "LR can't open catalogue ...."

Any idea what is going on there? it is deeply frustrating
thks and regards
Christian
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Christian Fürst

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Posted 3 months ago

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Johan Elzenga, Champion

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Lightroom creates a 'catalogname.lrcat.lock' file to stop other apps from opening the catalog at the same time. That file is deleted when Lightroom quits correctly, but it can remain when the quit is not done properly (like a crash). Look for that file and remove it. Then you can start Lightroom again with this catalog.
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Christian Fürst

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Tks, Johan, I did so, but the .lock-file returned without any other possible application being opened. Also PS had not been opened. I'm afraid this freak michgt happen again and I will have to built a new catalogue each time. And, by the way, I always close LR correctly and never had a crash, including a windows-blue-screen. I was wandering whether this was a bug within an update version of LR ?

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Johan Elzenga, Champion

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I am not sure you understand what I said. Maybe you should read it again. When you start Lightroom, the lock file should return. But when you quit Lightroom, it should be deleted again. 
If the lock file does not get deleted, then the next time you start Lightroom it will think that another application has already opened the catalog. This has nothing to do with Photoshop or any other application being open. And this is not a bug in an update, because then everybody should have this problem.
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Christian Fürst

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Hi Johan, I did understand your advice. but how come something like that happens just now that never happened before. and 2) now that I let LR create a new catalogue, can I delete the old one? In any case, thanks for your help

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Johan Elzenga, Champion

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I would continue with the old one. There was no reason to create a new catalog, and by doing so you probably lose all previous edits and metadata. Why would you want to do that? I can’t tell you why this happened, but if it happens often, then you will have to find out why because that is not normal behavior.
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Christian Fürst

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Hi, for some reason, it appears to have stopped now. regarding the new catalogue: it has taken ages but as far as I can see, all previous Metadata are still available. Will keep you posted if this thing should continue...

(Edited)
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Christian Fürst

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unfortunately, this afternoon it happened again. fortunately it was possible to open the previous catalogue, if only after a several hours long periode of LR checking the "integrity". Once LR had opened, I was able to access the new catalogue. This all is becoming a big nuisance. I wonder if there is anything I could do to solve the problem?? may be, if I uninstall and re-install LR? I am really gratefull for your advice

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Johan Elzenga, Champion

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If it happens again, then deleting the .lock file should be all you need to do to allow Lightroom to open the catalog you were working in. Doesn't that work, or did you still not understand that?

You could indeed try to uninstall and reinstall Lightroom to see if that helps. Don't worry, that will not affect your catalogs in any way. Resetting the preferences might also be an idea. Try that first.