Could you please confirm what happens when you try to import more images in that catalog?
Do you receive any sort of error message?
I'm not seeing any error messages. The import commands in the File dialog box are grayed out, and the import button on the left panel of the Library module is inactive. When I launch the app, the button is active for a second or two, but then goes black.
You should be able to choose Import option.
Go to Lightroom Preferences > File handling > increase the camera raw cache size to higher end > relaunch Lightroom and then, check.
I changed it from 2gb to 4gb, no help. Then changed to 8gb. Still no help. It launches and the import button is active for a second then goes black. I agree it is strange. I use it every day and have never seen this before.
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Would suggest you to reset Lightroom Preferences and then, check : Resetting (or 'Trashing') the Lightroom Preferences file - Lightroom Forums
I believe 8GB would not be enough for these many previews.
You should increase it to atleast 50GB once done with Preferences reset.