Error "Cannot create a file when that file already exists" in automation script, after upgrading (4310164)

After upgrading to 4.2/4.2.1 an automation task, that has run successfully in previous versions, no longer works. The following error shows in the log file

"Cannot create a file when that file already exists". 

The task has 3 activities that write to the same file (different tabs). The file name created has a suffix that was custom built

WORKAROUND

1. Export each 'select to file' activity to the same regular Excel file (no suffix)
2. Add a Copy File activity at the end of the last 'select to file' activity and add custom suffix to the newly created file.

STATUS

Waiting for fix in a future release of Toad Data Point