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If none of these options is used, the default Workspace location is used:
%USERPROFILE%\.JIRAClient (например, С:\Users%USERNAME%\.JIRAClient).
So if your JIRA Client keeps starting empty, please make sure JIRA client always has read/write access to the Workspace folder.
If the problem persists with the default location for some reason, you can set a different location for the Workspace folder, which will be accessible 100% of time. Here are instructions on how to do that.