Memory Leak on export png????

[Mark Smith]

on mouseUp
   set the directory to "/Users/marksmith/Desktop/xpics/"

   repeat with x = 1 to 1000
     if the mouse is down then
       exit to top
     end if
     put x & ".png" into tDest
     set the backgroundColor of grp "counter" to any item of "red,blue"
     set the backgroundColor of fld "counter" to any item of  
"green,yellow"

     put x into fld "counter" of grp "counter"

     export snapshot from grp "counter" to file tDest as PNG
     wait 1 millisec
   end repeat
end mouseUp



Weird...I set this up earlier and was finding that it would stop with  
an error, at various points, but usually at the 256th iteration, and  
never later.
The error was something along the lines of 'could not write to file....'

However, if I changed <put x into fld "counter" of grp "counter"> to
<put "x=" & x into fld "counter" of grp "counter">, it completed  
without problem every time.

Activity Monitor (I'm on a G4 mac laptop, Rev 2.8.0) reported only a  
tiny increase in real and virtual memory use.

I had to go out, and quit Revolution. Now I've come back, the same  
stack works correctly whatever I put in the <put x into...> line.

Best,

Mark