I'm using Windows 98 and a machine with plenty of memory. DBT 10.4 (April 16, 2002 release) Occasionally when I'm trying to copy/paste large amounts between braille files, I get the dreaded Illegal Operation message. I'm attaching a file: I want to copy this into another file, but it crashes. Can someone at Duxbury shed some light on this? Thanks. Oh, I do know how I can work around it this time, but this shouldn't be happening. Dan DBTW caused an invalid page fault in module KERNEL32.DLL at 0177:bff7a138. Registers: EAX=03277364 CS=0177 EIP=bff7a138 EFLGS=00010212 EBX=004ffad0 SS=017f ESP=0071f5c8 EBP=0071f5fc ECX=69726320 DS=017f ESI=004f9354 FS=45df EDX=61695d74 ES=017f EDI=0327dae0 GS=333f Bytes at CS:EIP: 89 51 08 8b 53 08 8b 43 04 89 42 04 8d 93 0b 10 Stack dump: 0071f5fc 004f9354 004f0000 00019570 bff7b31d 004f0000 004f9354 0000677c 00000200 0000ffff 004f1fea 00019570 004f9354 0071f644 bff7b934 004f0000