Setup: Toucan Version 2.07 installed on C: drive, trying to sync a directory from C: to a USB external hard drive K:
In Sync, for Copy and Mirror (Copy) it shows preview correctly. For Update or Mirror (Update) it immediately put up an error box that says:
An unhandled exception occured. Press "Abort" to terminate the program, "Retry" to exit the program normally and "Ignore" to try to continue.
Abort and Retry immediately close Toucan, Ignore stays in Toucan but the right hand window loses the ability to open subdirectories to show files.
Edit: Just tried it with 2.06 and it works OK. After pressing the preview button, the right window window flashes blank and then refills with all the filenames in proper "action" colors.