"an error occurred when trying to change modules"

When I switch repeatedly between Library and Develop with the R and E keys, I always sooner or later run into a problem where nothing happens when I press R. Really that should go the Develop module and enter crop mode -- what I'm usually trying to do, when this happens, is crop a bunch of photos. So I'll be using Library mode to identify the photos that need cropping, stepping through photos with the arrow keys, then when I find one that I want to crop, I press R, enter develop+crop mode, crop the photo, press E to return to library+loupe view, and continue.
Sometimes this works 10 times, sometimes it only works twice, but always, relatively soon, when I press R, "nothing" will happen. Actually what's happening is an error dialog appears saying "an error occurred when trying to change modules", then the error dialog immediately disappears before I can read it. I know what it says, because if I click the Develop module with the mouse, I get the same message but it sticks around until I press OK.
Once this happens, I'm entirely unable to use the Develop module until I quit the program. I had to quit and restart LR about 20 times during an hour of working with it last night, and this morning, in the first 15 minutes, I'm already on the 3rd restart.
Anyone else see this?
Details: LR 1.1 on Mac OS 10.4.10, 4-core Mac Pro, images are a mix of JPG from a pocket camera and NEF from a Nikon D40. I don't think it is related to the specific images, as it strikes apparently at random, and after exit and restart, I can crop that same photo, but a different one will eventually cause the same problem again.

Sean, thanks for the Return key tip. I knew about that at one point, but lately I was trying to use Enter (the one on the numeric keypad, at the very lower right corner of the keyboard, which is really easy to hit with my thumb even when my hand is on the mouse! And Enter doesn't invoke the crop, so I forgot that Return did). That is a better way.
I don't see the RE problem on my MacBook, only on my desktop computer, and that one is also experiencing other flakiness (
metamatt, "missing text / thumbnails / many Lightroom UI elements disappeared" #, 18 Aug 2007 3:08 pm) so I think I'm going to try a complete reinstall there.

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TimOlive wrote:
LR is also unable to open a small LR catalog it created on the internal Macintoch HD SSD, back when this copy of LR was installed.
How and where did you create that small catalog? Sorry for the question, but you do have licensed version of LR 5 and you only use it in your old computer? In other words, you do not have a second copy installed on a laptop, do you?
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Hi 99jon,
Many thanks for that. Had been going through this list yesterday and now again today:
Ref Solution 1: Lightroom is at its latest update
Ref Solution 2: It's interesting how I cannot find the Preferences file anywhere on my mac. (new mac pro, OS 10/9.2) . . .
Ref Solution 3: Lightroom doesn't allow me to do anything after the error message appears
Ref Solution 4: don't have any Nik Software plug-ins
Ref Solution 5: checked permissions and changed all to "Read & Write" - makes no difference
Ref Solution 6: I don't have a different user account on my mac.
Not sure what else to do.

I have a mac, and am trying to install lightroom 3.6, everything says it has installed ok, but when trying to open I get this message...An error occurred when attempting to change modules.

anybody have any idea?

https://forums.adobe.com/search.jspa?q=error+occurred+when+attempting+to+change+modules&pl ace=%2Fplaces%2F1383621&depth=…

Another "An error occurred when attempting to change modules" error

Hello all:
After using Adobe Photoshop Lightroom on Mac OSX trouble free for the past 6 months, I opened up Lightroom today and received the following error: "An error occurred when attempting to change modules." I had not made any changes in between when it worked normally and when the error started to occur. I beleive the last thing I did before this error occurred was to go into the Print Module.
Other information--I keep all my RAW .NEF files on an external Firewire (800) 750 GB drive. This is on Mac OS X 10.5 running Adobe Photoshop Lightroom 1.3 and also with 1.4.1. I'm running an iMac 20" with dual-core 2.2 Ghz Intel processors and 4 GB of RAM. I have around 25k images total.
When I noticed this problem, I was on Lightroom 1.3. I immediately upgraded to 1.4.1, which did not solve the problem. I have also tried many suggestions in the forums including uninstalling the application and removing the .plist file.
I thought I had come up with a solution by creating a new catalog, then importing the former into it. While this seems to work immediately after the import process, as soon as I close it, the problem manifests itself again.
More details that may or (likely) may not help:
- Going to the Develop and Print Modules gives me no problems. However, when I click on Library, Slideshow, or Web, I see the error.
- I upgraded my Mac to the latest patch level after observing this error to no avail.
So it looks like my choices are to create a new file and reimport every single time, or lose all of the work I've done for the past 6 months on thousands of images.
Can anyone please help???? I promise to post the solution when we fix this darn thing so others may benefit. I'd be happy to run through any troubleshooting that y'all would suggest outside of switching to a Canon.
Thanks!!!!
Matt

I'd first check for the existence of a file ending in .lock, which should be present when LR is in use, but if it exists when LR is quit, it can cause problems, and should be deleted.
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An error occurred when attempting to change modules Lightroom 5 CC

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Hi 99jon,
Many thanks for that. Had been going through this list yesterday and now again today:
Ref Solution 1: Lightroom is at its latest update
Ref Solution 2: It's interesting how I cannot find the Preferences file anywhere on my mac. (new mac pro, OS 10/9.2) . . .
Ref Solution 3: Lightroom doesn't allow me to do anything after the error message appears
Ref Solution 4: don't have any Nik Software plug-ins
Ref Solution 5: checked permissions and changed all to "Read & Write" - makes no difference
Ref Solution 6: I don't have a different user account on my mac.
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An error occurred when attempting to change modules.

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Hi, I¹ve been through it again to ensure I¹ve not forgot things. Completely
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