diagram wires missing in windows xp

[eng.tech]

I'm using LV 7.0 on a XP home edition machine. All previous VI's were recompiled and run fine on XP but in the block diagram I have wires randomly missing. When you click in the space where there should be a wire, the invisible wire is highlighted so there is a connection.
View the attached jpg and note that the vi is able to run but the some wires are missing and some case structures are outlined wrong.
Any ideas?

[altenbach]

What model is your video card?

As a first step I would see if there is an updated driver for your video card and OS.

Also try different color depth settings (16 bit, 24 bit color, etc.)

[eng.tech]

Thanks for you response.
In answer to you questions:
No new updates on driver for Matrox Graphics MGA-G100 AGP card or OS.
Currently running 32bit with 1024x Res. Changed all the way down to 16bit with 800x Res. Problem seemed to get worse with the lower resolution.

[Ted Hildum]

I have the same problem with Win XP Pro, using the same graphics board. I sent email to NI support, and they advised turning off driver video acceleration. Go to the display settings dialog, select "advanced", select "Troubleshoot" tab, back the acceleration slider off 1 click (suppress cursor and bitmap accelerations). This cured the problem on my system

[Tim_W]

This worked on my system, too. I had no problems prior to upgrading the OS from NT to XP. Then some of the wires disappeared. After backing off the acceleration one click, the wires reappeared.