From the logs I see the following:
Exception: Invalid session-cookie. Authentication refused by FWM
Please run the following command to turn on fwm logs:
fw debug fwm on TDERROR_ALL_ALL=5
than reproduce on window 7 and provide the following logs located at the server:
$FWDIR/log/fwm.elg* (fwm.elg.1, fwm.elg.2…)
$FWDIR/log/cpm.elg*
Regarding window 10, are you sure you have administrator privileges? seems like a permission issue, please try to run as administrator.
Note: to turn off the logs you may run:
fw debug fwm off TDERROR_ALL_ALL=0