Removing flash drive causes DOpus to crash

This morning I decided to copy MP3 files off my portable flash drive onto another flash drive currently hooked via USB port. The operation went smoothly...except after I manually shut down the flash drive before physically removing it...DOpus would not update the lister showing the flash drive had been removed. So when I manually closed DOpus I got the error message saying DOpus has caused an internal error and needed closing.

Just to be clear...I'm using the latest and most updated release version on Windows XP Service Pack 2 on my Dell Inspiron 2200 with 512 mg of RAM.