Gw 8.02 on NW 6.5

My GW Library needs maintenance done on it but when I run GWcheck
standalone, I get a message indicating that there is a similar request
already underway.

There is no activity at all on the POA (I checked the Web portal - no
tasks pending)

When I try to run the same libary job using C1, the task is recognized
by the POA (I can see the message in the Verbose log) but then nothing
happens

How can I clear our whatever old taks in the queue ?

Steve