The culprit is FTE, http://fte.sourceforge.net/. When
starting FTE from inside a Console window (1.42), the
window will not be cleared and, instead, the upper left
corner will display two odd control characters in
yellow text on bright blue background. I have tried
this in multiple sizes, transparency configurations et
al. The "normal" console window (shown by unchecking
"Hide Console") displays FTE as it's supposed to be.