Crystal Reports 2008 Can not edit in the formula editor? Help?

I just used Crystal 2 weeks ago just fine. Now when I go into a report and then into the select expert then into the formula editor it will not let me edit my formulas. The cursor is there, but I can do anything. I tried to find and replace, but I get the text is read-only. How the heck do I fix this? It's pretty urgent.

Edited by: Ludek Uher on Jan 6, 2012 8:58 AM