that does look like the language setting and you said you doubled checked it...
quick troubleshooting trick you can try-- go to your previous version wiki, remove all tiddler titless from the default tiddlers list in Control Panel>Info, to prevent any tiddlers from opening with the loading of your wiki after upgrading, then upgrade that will rule out the startup tiddlers if you have any being the issue -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/79af3e69-3a03-4656-bff8-f101aace4be1%40googlegroups.com.

