My forever account name, Cat_Thing. And I'm pretty sure that I got rid of the .sav files but the same message just kept popping up.
so looking up your account on the Forever Network I can see that your country flag is HK (Hong Kong). that error message is essentially saying it couldn't find the flag for HK. after checking the available flag sprites, there is no flag for HK either
I would patch this straight away, but annoyingly I'm also working on a netcode rework at the moment which will take some time, so this among a few other things won't be fixed until that's finished. I could however change the country code on your account temporarily to "XX" until this is fixed?