Microsoft KB Archive/34281

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BUG: Pressing BACKSPACE on Breakpoint Line Del Wrong Character

Article ID: 34281

Article Last Modified on 11/21/2006

This article was previously published under Q34281


The following problem occurs when using breakpoints in the Listing window in QuickBasic Version 1.00 for the Macintosh . When there is a breakpoint on a line and the BACKSPACE key (or DELETE on newer keyboards) is pressed, the breakpoint is deleted and the second character to the left of the insertion point is improperly deleted. (Normally, pressing BACKSPACE removes the first character to the left of the insertion point.)

Breakpoints are useful debugging tools. However, to press BACKSPACE (or DELETE) on a line with a breakpoint on it, you need to either turn the breakpoint off or move the insertion point an extra place to the right.

Microsoft has confirmed this to be a bug in Version 1.00. We are researching this problem and will post new information as it becomes available.


A breakpoint can be set on a line by positioning the insertion point on a line and pressing COMMAND+B, or by clicking the STOP symbol in the lower-left corner of the Listing window and then clicking the desired line.

A breakpoint can be removed in any of the following ways:

  1. If part of the breakpoint line is highlighted (i.e., selected in inverse video), pressing the BACKSPACE (or DELETE) key correctly removes the breakpoint.
  2. Pressing COMMAND+B on a line that contains the insertion point toggles the breakpoint off (or on).

Additional query words: MQuickB

Keywords: kbbug KB34281