Hi,
Can you use Length( ) and check till which length it is giving the results and not giving #OVERFLOW?
Once done, go to the Universe parameters (File --> Parameters --> Control tab).
Check the value assigned against "Limit size of long text objects to a specified value" parameter.
If it is near to what you got from Length ( ),try increasing this value and check.
As far as I remember, the limitation is approx 65,000.
Regards,
Yuvraj