The work-around for the gtk-2 bug, requiring export GDK_NATIVE_WINDOWS=true no longer works very well in tc3.0a.
As soon as I right-click on a file in rox, and select open as text, and close rox, the previously set global variable GDK_NATIVE_WINDOWS is cleared.
I checked back into tc2.11.1 and the problem is not present there, so I report it here.