Encountered on macOS Big Sur when using BlueJ on two different accounts. I haven't encountered this with previous versions. When BlueJ.app was added to the Applications folder of a second account on a single machine, attempting to start BlueJ on the first account resulted in a BlueJ alert window (yellow triangle icon) with the message: NoJavaDictionary. If BlueJ.app is re-copied to the Applications folder of the first account, the problem then repeats with the second account. --- **Issue metadata** - Issue type: Bug - Priority: Medium