Thanks for the suggestions. Either way I'm still getting the error periodically. Here's my exact code in the different places I have them:

---AfterRowcolChange
LPARAMETERS nColIndex
select tranfile
grno = RECNO()
THISform.pageframe1.page1.grid1.setall("Dynamicbackcolor", ;
"IIF(RECNO()=grno,RGB(128,192,192),RGB(255,255,255))","Column")
select receipt
THISFORM.PAGEFRAME1.PAGE1.REFRESH()

----Grid Init
PUBLIC grno
select tranfile
grno = RECNO()
THISform.pageframe1.page1.grid1.setall("Dynamicbackcolor", ;
"IIF(RECNO()=grno,RGB(128,192,192),RGB(255,255,255))","Column")

----Grid Refresh
select tranfile
grno = RECNO()
THISform.pageframe1.page1.grid1.setall("Dynamicbackcolor", ;
"IIF(RECNO()=grno,RGB(128,192,192),RGB(255,255,255))","Column")
select receipt

Thanks.

Joe