Changes to Code in QBasic Disappear After Pressing CTRL+BREAK (75520)

SUMMARY

In QBasic, if you interrupt a program with the CTRL+BREAK key combination and you make a change to nonexecutable code, the following message is displayed:

You will have to restart your program after the edit. Proceed anyway?

If you did not press ENTER on the line where you changed the code, a problem occurs. After you acknowledge the "Proceed anyway?" message (by pressing ENTER or clicking OK), your editing changes seem to disappear, and the code reverts back to its earlier appearance. Despite the appearance, the code actually has changed, and you can successfully use the Start, Restart, or Continue command from the Run menu.

Refreshing the code window (as described below) updates the code's appearance.

STATUS

Microsoft has confirmed this to be problem in Microsoft QBasic version 1.0 and 1.1 provided with Microsoft MS-DOS version 5.x, 6.0, 6.2, and 6.21. We are researching this problem and will post new information in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

Note: This problem only applies to changes made to nonexecutable code; it does not apply to comment lines. Most changes made in executable code do not prompt the warning, and the changes are correctly displayed (without reverting to the pre-edited appearance). Changes made to a DIM statement that appear after a $DYNAMIC metacommand (which is an executable instruction) will prompt the warning and behave as described above.

To work around this appearance problem and correctly update the screen to show the code changes, you can use any of the following methods:

Move the cursor back to the changed line and press the ENTER, DELETE, BACKSPACE, TAB, or SPACEBAR key.
Scroll the screen so the changed line is no longer visible, then scroll back.
Press F4 to switch to the output screen, then switch back by pressing any key.