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I created a small test program trying to reproduce the problem on Windows 7, Python 3.4, and TK 8.6. Unfortunately it works fine and each line is highlighted as a user presses ctrl-B. I got the select code straight from IDLE. Any other ideas Roger? This might be an IDLE bug after all.
from tkinter import *
class SelectTest:
 def __init__(self):
 self.mainwin = Tk()
 # Create a text widget
 # idle creates the text widget like this
 #self.text = text = MultiCallCreator(Text)(text_frame, **text_options)
 self.textbox = Text(self.mainwin, width=80, height=10)
 self.textbox.pack()
 # Add some text
 self.textbox.insert(INSERT, "line 1: Select some text\n")
 self.textbox.insert(INSERT, "line 2: Select some text\n")
 self.textbox.insert(INSERT, "line 3: Select some text\n")
 self.textbox.insert(INSERT, "line 4: Select some text\n")
 # Add the binding
 self.textbox.bind("<Control-Key-b>", self.select_just_like_idle)
 # just in case caps lock is on
 self.textbox.bind("<Control-Key-B>", self.select_just_like_idle)
 self.lineno = 1
	
 def select_just_like_idle(self, event):
 print("Select just like idle was called")
 if self.lineno is not None and self.lineno > 0:
 self.textbox.mark_set("insert", "%d.0" % self.lineno)
 self.textbox.tag_remove("sel", "1.0", "end")
 self.textbox.tag_add("sel", "insert", "insert +1l")
 self.lineno = self.lineno + 1
if __name__ == "__main__":
 # Start the program
 selectIDLETest = SelectTest()
 selectIDLETest.mainwin.mainloop()