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i got the same probleme .

how i make it

-1- connecte to webmin
-2- Use ...
-3- close the browser ( no webmin disconnect , i say clos
the browser)
-4- wait ( a long time ...)
-5- reconnect , if the option of "remeber me" is set to 1
i got the error .

it look like session/cookies ... timeout.

For me too , an refresh in the browser make it work again .