Overwriting a File on Transfer Freezes Window

From BulletProof Wiki

If you were trying to overwrite a local or remote file and your navigation window becomes disabled, you may have been affected by a known bug. You were supposed to see a dialog box asking you to verify that you wanted to over write the file -- however instead of seeing that dialog box, you are unable to focus on the navigation window.

The workaround is to delete the destination file instead of overwriting it. The next version of Bulletproof FTP Client should fix this. Check for new versions of our software at our download page.