I have now tried to sign into the forum on two different Macs running Firefox. When I enter my user name and password the forum ignores them and takes me back to browsing as if not logged in. I can't comment on anything or see if I have notifications. However, when I click the Kemper amps homepage icon it turns out that I have been signed in properly to all other services such as Rig Exchange.
If I use Safari everything works as normal. There is clearly some setting in Firefox that I need to change or there is something in the Forum software that hasn't been tested on Firefox and needs updated.
Anyone else experiencing this?