Three times now I have notice the EHandleOsError
error occuring under the following situation:

1. A file download is in progress.
2. The downloading file's progress indicator reaches 98%.
3. A message appears in the status window indicating something about a mismatch in expected data of the file (if these status messages were logged to a file I could give you the exact text).
4. The download progress of the file drops to 50%.
5. The EHandleOsError occurs.

This error may have something to do with the fact that a single file can be downloaded from multiple locations, and in certain situations the last few bytes of the file doesn't match. In the last few days I had one file that went fron 57% to 98% and back down again over a dozen times. It's possble that the EHandleOsError was occurring each time.

I'm turing off "Perform hash verify after download completes" on the Downloads tab of the Preferences box to see if this "fixes" the problem. I'll let you know.