I just had the same problem a minute ago with 188.8.131.52.
As recommended here, I tried to reload the meta data (as .XML-file) several times, but I didn't succeed.
Finally, I tried to extract and load the metadata as .APP and it worked.
To test it, I was replicating it on a second application: It doesn't work with XML, but it works with APP.
I hope this information helps.