Don't know if this has been reported before, but it's something I observed in all recent BW64 versions.
Something is wrong with the resize cursors. It affects all applications built with gtkdialog or gtk2dialog.
How to reproduce:
1) Open any resizable gtkdialog application, e.g. UExtract
2) Grab border with mouse and resize window
3) Repeat 2), but this time resize window back to its minimum size.
After finishing the resize icon does not disappear as it should. Not a big deal, but it's irritating.