I've experienced issues with the FLTK console (colinux-console-fltk.exe) but was unable to reproduce the problem systematically. What would happen is that using the command line, either with tab-completion or with scroll history (ctrl-p/up-arrow) at times text would not be cleared properly, leaving leftover text from the previously entered command. I've finally managed to pinpoint the problem and it appears to be related to all these issues (tab completion, history, backspace, etc.)
To reproduce the problem, in a bash shell using colinux-console-fltk.exe, do the following:
1. Type a very long string, at least 40 characters, say:
Now, press ctrl-a to get to the start of the line and press delete three times. What you'll see is this:
Notice how the digit 2 towards the end of the string are multiplied 4 times. The right output should be of course:
There are many other ways to cause this to happen, and it appears to be happening when the command string length is about 40 characters long.
Configuration: this happens on Windows XP SP3; both version 0.8.x and 0.7.3. This does not happen on colinux-console-nt.exe as far as I could tell.