It's not an error but a warning. The font one has been around for a while and is not a problem, it's just something that probably shouldn't be exposed. The one about regions overflowing is a result of how your document templates are designed, apparently something does not quite fit in some cases, this might be as simple as a string being too long. That said, the actual result may still look fine.
These warnings are generated by a library we're using and thus have no knowledge of document templates and couldn't give you a template name. You could of course manually generate some documents and see which of the templates generate the overflow warning.
The reason you see things like this now is a result of changes to our logging system, warnings like these used to be invisible in the logs. In cases like these I don't think they are very beneficial though.