P: Unable to relaunch after File>New Catalog/Switching catalogs, or relaunching with certain plugins

@UliP: "Regarding to the Lightroom Queen Forum a similar error occurred with the Tourbox plugin, which is now fixed by an recently published plugin update."

That person just reported the problem has come back with the most recent Tourbox plugin.

Lightroom Classic 14.5 doesn´t shut down when Midi2LR 6.2.0.1 is running.
I deleted all other 3rd party plugins and the bug still exists.
I can solve the problem by closing the Midi2LR.app before closing LrC!
If I deactivate the plugin completely, the problem no longer occurs.

LrC14.5, Midi2LR 6.2.0.1 , macOS 15 Sequoia, MacStudio M4Max, 64GB RAM 16 C CPU, 40 C GPU
==>> LrC doesn´t close the main window, Midi2LR App stays open.
and
LrC 14.5., Midi2LR 6.2.0.1 , Windows 11 newest update, Nvidia GTX 5070 with newest Studio drivers, I9-9900k, 64GB RAM
==>> LrC does close the main window, but leaves a "ghost process", visible at the task manager, preventing a new start of LrC. Midi2LR App stays open.

For debugging reasons I installed an older Version of LrC on my Windows 11 PC:
LrC 14.0.1 works fine without errors and closes as it should
LrC 14.1 works fine without errors and closes as it should
LrC 14.2 works fine without errors and closes as it should
LrC 14.3 works fine without errors and closes as it should
LrC 14.3.1 works fine without errors and closes as it should
LrC 14.4 works fine without errors and closes as it should

(Since my Mac Studio is brand new and I'm not yet very familiar with MacOS, I'd rather not install an older version of LrC here. However, I assume that the error also occurs in the same LrC version for Mac.)

Regarding to the Lightroom Queen Forum a similar error occurred with the Tourbox plugin, which is now fixed by an recently published plugin update.

Best reghards,

Ulrich

• Description of Issue

After shutting Lightroom Classic down it consistently fails to re-start without turning the computer off. 

• Lightroom Classic Version Number (Help>System Info…) 

14.5 Build 2025 08061311-4cf2162

• OS Version Number

11.0.26100

• Camera Model (sometimes necessary)

Not directly working with any camera, only with imported raw NEF files via directory.

• Step-by-step Reproduction Instructions (in precise terms, please)

I close Lighroom Classic using the X icon in the top right hand of screen, .

• The Expected Result
  

I can re-start Lightoom Classic when needed again.

• The Actual Result

It fails to restart, always.

Have discovered if I open task manager I can see one of several Lightroom Classic tasks active (with memory utilisation). After closing this task all Lightroom tasks cease (via Task Manager). Lightroom Classic can then be successfully restarted. Appears to be issue with this latest version. No issue before. I'd prefer not to have to do this...

@Rikk Flohr: Photography I'm not using the LogiOptions (or any other) plugin but have been experiencing very slow app closure/catalog switching for several versions and seems more likely to happen if I've been working in the app for a while.

For those Windows users on the thread, try going to File>Plugin Manager and disabling the LogiOptions Plugin. On my system that cured the issue. 

IDEM... 😢

I have trouble quitting 14.5 but on a Mac. Normal quit, not changing cataloges. I have to Force Quit. 

Just to add this isn't new to 14.5 and I've found that the "zombie" process does eventually close and LRc re-opens with the new/switched catalog.

I think that the announcement posts should be locked by default if you don't accept the users messages.

So, now I've to write again my problem to see if someone will answer. Or, at least, I hope Adobe will read it and will fix the issue.