Unable to rename profile

I've just moved to a new computer and am setting up Zotero on it. I have more than one Zotero profile, and want to rename the one labeled "default." When I click "Rename Profile," it brings up the Rename Profile dialog, then immediately covers it with an Error dialog containing this message:
this.init@chrome://zotero/content/xpcom/zotero.js:238:5
ZoteroService@jar:file:///C:/Program%20Files/Zotero/app/omni.ja!/components/zotero-service.js:351:23
createInstance@resource://gre/modules/ComponentUtils.jsm:90:19
@chrome://zotero/content/include.js:5:3
@chrome://global/content/commonDialog.xhtml:34:25
openWindowPrompt@resource://gre/modules/Prompter.jsm:1226:17
openPrompt@resource://gre/modules/Prompter.jsm:1115:12
openPromptSync@resource://gre/modules/Prompter.jsm:1046:10
nsIPrompt_prompt@resource://gre/modules/Prompter.jsm:1493:10
prompt@resource://gre/modules/Prompter.jsm:383:14
RenameProfile@chrome://mozapps/content/profile/profileSelection.js:263:21
oncommand@chrome://mozapps/content/profile/profileSelection.xhtml:1:1
It has a "Check for Update" button at the bottom. If I click it or try to close the window, it closes all three windows.

If, instead, I move this out of the way to reveal the Rename Profile dialog, and I change the profile name, the name change is undone by any activity with the Error dialog after that.
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