I have this piece of code

Function StrWhile(tcStr, tcRepl, tcReplWith)
Do While Atc(tcRepl, tcStr)>0 And tcRepl#tcReplWith
	tcStr2=Strtran(tcStr, tcRepl, tcReplWith)
	If tcStr2==tcStr
		Exit
	Else
		tcStr=tcStr2
	Endif
Enddo
Return tcStr

The reason I have this if/else block is that it sometimes doesn't replace the string. I've set the watch on the atc() expression, and it remains unchanged, somewhere about 200K or more.

Is there a known bug or limitation that would make StrTran() not work sometimes - when a string is too long or under any other weird circumstances?