[JavaScript Error: "SyntaxError: invalid escape sequence" {file: "resource://zotero/loader.jsm -> resource://zotero/react-dom.js" line: 17244}]

Can you provide a Debug ID (different from a Report ID) for Zotero startup through getting the error, using the "Restart with Logging Enabled…" option?

TypeError: ZoteroPane_Local.tagSelector is undefined

TypeError: ZoteroPane_Local.tagSelector is undefined
ZoteroPane</this.setTagScope@chrome://zotero/content/zoteroPane.js:1123:9
ZoteroPane</this.onCollectionSelected/</<@chrome://zotero/content/zoteroPane.js:1198:9
Zotero.LibraryTreeView.prototype.runListeners<@chrome://zotero/content/xpcom/libraryTreeView.js:79:36

If you check your database integrity from the Advanced → Files and Folders pane of the Zotero preferences, does it pass?

After clicking the Check Database Integrity button, does it return a message saying “No errors were found in the database” or similar?

Could you go to Tools → Developer → Run JavaScript, paste in the following code, click Run, and let us know the result?

var el = document.getElementById('zotero-tag-selector-container'); el.hasAttribute('collapsed') + ':' + el.getAttribute('collapsed') + ':' + ZoteroPane.tagSelector

Do you see the tag selector in the bottom left? If so, does it help if you try to close it and reopen it, and then restart Zotero, or some variation on that?

OK, what's the result of this?

document.getElementById('zotero-tag-selector-container').height + ':' + typeof Zotero.TagSelector.init(document.getElementById('zotero-tag-selector'), { container: 'zotero-tag-selector-container', onSelection: ZoteroPane.updateTagFilter.bind(ZoteroPane) })

If you create a new Zotero profile called "Test", does it happen in that one too?

(If not, we'll do further debugging to figure out the problem in your original profile.)

Can you provide a Debug ID from the new profile, using "Restart with Logging Enabled…" again?

That’s either the original profile or it didn’t properly create a new Zotero data directory like it’s supposed to when you create a new profile. Can you start up in the new profile, go to Advanced → Files and Folders in the preferences, and make sure the data directory is set to a “Zotero Test” folder in your home directory, next to the existing “Zotero” folder? You may need to create that folder if it doesn’t exist.

Then I’d want to see another Debug ID starting up in the new profile with that data directory set.

If you change the language in the Advanced pane of the preferences to English, does that make a difference?

Thank you so much!!! I have never thought of that.

OK, so you can reopen the profile manager with -P and delete the test profile, and you can also delete the "Zotero test" folder in your home directory.

Back in the original profile, if you switch it back to "Deutsch", this happens again? Unfortunately I'm not able to reproduce this with the German locale, and no one else has reported it, so it's not totally clear what's causing this…

I mean it probably won't work again, but you can then switch right back to English. For troubleshooting, it's just helpful for us to confirm that switching to German reliably breaks it for you.