After upgrading from GnuCash 2.6.18-3 to GnuCash 3.4, the QFX import tool throws a Drive Not Ready error for a nonexistent floppy drive A: Build 3.4+ (2018-12-30) Stable Win7 Enterprise x64 SP1 build 7601 Steps to reproduce (on this computer): - Start with an existing stable installation of 2.6.18 on Win7, and existing accounts files on a network drive mapped to a Windows drive letter (Z: in this case) - Run gnucash-3.4.setup.exe - Accept all defaults during installation, including removal of v2.6.18 - Start GnuCash, ensure accounts are still correct, close GnuCash - Start GnuCash. Click File - Import - OFX/QFX. GnuCash displays the "Select an OFX/QFX file to process" dialog. On the left sidebar, it lists file locations: Recent, Home, Desktop, etc., then mapped network drivers, then local drives, and at the bottom, Floppy Disk Drive (A:). (The computer does not have a floppy disk drive, but I believe Windows includes a drive mapping for A: by default on any computer that's physically capable of supporting one.) After about 6 seconds, an error dialog appears: gnucash.exe - Drive Not Ready The drive is not ready for use; its door may be open. Please check drive A: and make sure that a disk is inserted and that the drive door is closed. Cancel / Try Again / Continue Cancel and Continue both make the dialog appear again after 6 seconds. Try Again makes the dialog reappear after either 4 seconds (if the "Select an OFX/QFX file" window is still open) or an indeterminate, much longer, time (if the file open dialog has completed). The program is still semi-usable while this dialog is open, but the Drive Not Ready error remains on top, obscuring whatever window is behind it. A spinning-wheel cursor may appear, but UI objects are still clickable as if it were a standard cursor. Once triggered, the Drive Not Ready dialog cannot be dismissed permanently; when dismissed, it reappears every 6 seconds until you close GnuCash completely. If I roll back to 2.6.18, I cannot reproduce this error. However, it is now unusable on the dataset that was touched by 3.4, due to a "This dataset contains features not supported by this version of GnuCash" error. If I then reinstall 3.4, the Drive Not Ready error is back. I've rolled our production install back to 2.6.21, which appears to be stable so far.