John,

Do you mean that you've increased the color depth at the Windows level, like from 256 colors to 64K colors to 16M colors?

If so and you are getting C05 errors the biggest suspect is your video driver. Check to make sure you are using the latest drivers.

>I am trying to make my form and control look more attractive and colourful.
>I found that, once VFP try to execute job under such "colourful" environment, C5 is easier to be "tiggered" once any syntax error or small small mistake happened.
>
>Is it the weakness of VFP?