Hello Ravi.

- When the form containing the grid is launched, Columns 2-8 are blue
- When I selected March 18, 2001 (cuz I have some test data for that date), I get the message "Expression is invalid. Use a valid expression for DYNAMICBACKCOLOR property". Then I loose the colors after that.
- I then set the sytem date to March 18, 2001 and launched the form
- All cells in the columns without the word "BLOCK" were in blue and the ones with "BLOCK" were in red.
- However, when I click another date on the calendar (even the next day 19th) I get the same message "Expression is invalid. Use a valid expression for DYNAMICBACKCOLOR property".

Off the top of my head, I would say that it is something in your code that is causing the error because the code sample I gave you was tested and worked just fine with no errors.

My suggestion to you is to start removing things from your grid one at a time until the error goes away. Then you have some hope of tracking down the bugs in your code.