As per bjtech's advice:
Editing the registry setting and putting the clear type text to off in the landscape mode fixed the disappearing text.
Look for this in your registry, Change the 0 to 1 and save it:
[HKEY_LOCAL_MACHINE\System\GDI\ClearTypeSettings]
"OffOnRotation"="1"
It is set to "0" by default. There may be other solutions, but this worked for me. Only problem is this disables cleartype in landscape mode. In portrait mode everything works correctly even with cleartype on. Do a soft reset after applying this edit
You can get a registry editor that will work on your Touch Pro. Personally I prefer PHM's registry editor program which you can get at:
http://www.phm.lu/downloads/download.aspx?{940B734A-C437-41C7-ADED-2A4418802FD3}
Under Package Selection download: Pocket PC 2000,2003 (ARM, PXA), this is the correct one for the Sprint HTC Touch Pro. I am not sure if it is correct for any other devices.
As always these programs are use at your own risk, if your not comfortable editing stuff in the registry then I would suggest leaving it alone and going into a Sprint service store to get technical assistance.
Good Luck
