>Thank you Venelina. I did what you said and it works now. I forgot I could open the form as a table. Almost all rows contained ColorSource=3. I deleted all of the rows where ColorSource=3 by double-clicking on each of the memofields in the column named Properties.

I strike this problem evry time when I begin conversion of FP2.x to VFP6.0/7.0. There are a few other properties which create the same problem.
I am glade that I could help you