I have been seeing this error (pasted below) for at least the last week or so.
We're sorry but a serious error has occurred in the system.
I basically cannot get into the site. In fact, before I found a solution, I just avoided using the forums until it would eventual "fix" itself which could take days or I had to clear all cookies. This is to say that a problem like this should be fixed and that Adobe may be missing important site traffic, the all important neighborhood bustle so to speak which makes this community vibrant.
My current solution is to go into my browser's settings for cookies and, instead of deleting all cookies, I just delete cookies for forums.adobe.com (not adobe.com, but specifically forums.adobe.com). After I do that, it allows me into the site without the need to login... apparently using my existing cookies/login state for adobe.com. So something forums.adobe.com (Jive?) stores in users' browsers cookies isn't working or is causing something elsewhere not to work etc.
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We've applied a temporary fix that has resolved this for the time being. We should have a permanent fix in place early next week. I'll follow up System error when it has been permanently resolved. In the meantime, I am closing this thread.