A lot of my users run anti-virus software (usually because they're at institutions that require it) and have reported problems. I've installed AVS, too, and see that often there's a -47 error (file is busy) exception when when a Valentina database is closed (myDatabase.close). I've trapped all the calls I've found in try-catch blocks and just let them fail silently, which may or may not be a good idea. But even though I've done that, I've had some reports I can't reproduce of -47 errors occurring elsewhere with a Valentina call. I've had no other software with this issue. I wonder if there is something you're doing when closing the database that could avoid this problem (uses can't or won't disable the AVS, and whitelisting sometimes doesn't work)? If you installed AVS on one of your Macs I'm sure you'd see the problem.