In mid-March and again April 26, 2019 Malware bytes flagged my DigiKam 6.1.0 as ransomware. It quarantined both the exe file and the desktop shortcut with no warning and no messages afterward. One of the DigiKam team suggested that an antivirus might be behaving this way. Today I looked in the quarantine list and noted that Malwarebytes had indeed quarantined the program file. This seems strange to me because DigiKam has been available for many years, and I've used it for many years.
I suspect that the Malwarebytes flag may be partially responsible for DigiKam behavior that prevents me from tagging images, marking pick data or marking color labels. The files show no signs of having accepted the changes in status; new tags specifically are not accepted in the DigiKam environment.
I did add exclusions for both the DigiKam folder and the exe file, rebooted and tried again to no avail.