QB Editor Causes Fourth Line to Be Overwritten by Third Line (41537)

SYMPTOMS

When the following sequence of events occurs, the QB.EXE editor causes the fourth line to be overwritten by the third line; therefore, the information on the third line is duplicated:

Run QB.EXE and type the program example shown below.
Type an additional word on line three following BULL.
Try to move the cursor down one line with the DOWN ARROW key.
Clear the error message; press ENTER.
Use SHIFT+UP ARROW to highlight all lines.
Press the TAB key.

This problem appears only when an error occurs prior to performing the text selection step.

STATUS

Microsoft has confirmed this to be a bug in the QB.EXE program provided in QuickBasic Versions 4.00, 4.00b, and 4.50 and to the QB.EXE program supplied with Microsoft Basic Compiler Version 6.00 and 6.00b (buglist6.00, buglist6.00b) for MS-DOS and OS/2. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

The following is an example code:

'create a program with several lines
'make one of the lines call a subprogram
'cause an error by adding an extra word on the call line
'just press return
'start from line 1, use shift+down arrow to highlight all lines
'press the TAB key
'Line three replaces line four
    REM line one
    REM line two
    CALL bull
    REM line four