One of my teammates is getting a similar issue:

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Hello,
Thank you for contacting us on that matter,
Could you create a portable version of RDM and let us know if the issue still occurs?
The portable version will use the connection.db file, but it will not use the .stv, .cfg, and other configuration files.
Please follow the steps below:
(Please close RDM first.)
Best regards,
Tommy Sanders