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5-th worker doesnt connect , doesnt mine

I have problem with starting 5-th worker
until now, i have been mining with 4 workers
and normaly, 5-th worker didnt wont to connect and start mining, because 4 workers are free
I send 7$ to my account, and now I have 7$ in Funds, and 9$ in Balance
but, 5-worker doesnt want to connect
I made all setting as previous 4 workers, but does not work
I have deleted 5-worker 2-3 times, and added again, does not start mining
what should I do to start 5-th worker mining ?