Redlines appear around while loop, it flashes, but shows no errors in LV7.0

[VCTECH]

We have a simple VI in LabVIEW 7.0 that utilizes a while loop. It looks the exact same as that of other students in my class, but when it executes the first time it works fine. When execution is stopped, it cannot be restarted. It immediately brings up the block diagram, puts redlines immediately inside and outside of the while loop and inside of the window. These redlines flash on and off. The run arrow is not broken and no errors are reported. If a new while loop is inserted, it will execute again, but only one time. What could be the problem?
VI is attached.

[tbob]

The red lines means a breakpoint is set at the loop. Go to the tools palette and select the breakpoint tool (looks like a small red stop sign). The mouse icon changes to the breakpoint tool. Click anywhere on the loop border. The red lines should go away. You may have to exit the vi and restart. The vi should run OK.