I've looked back, and I didn't end up creating a support ticket for this so can only assume the problem fixed itself or we found a workaround.
We did have a lot of problems with multilingual pages back on the 4.x releases, but Sitefinity has moved on a lot since then and I see you mentioned you're on v7.
In the past when we've had odd issues like this, an iisreset has fixed things. Other than that, have a look in the log files in App_Data\Sitefinity\Logs and see what errors you have in there.
Hope that helps