Entire SharePoint 2010 Foundation site goes read-only!

Running SharePoint Foundation 2010 on Small Business Server 2008 Standard with databases on SQL Server 2008 R2. Today, in a span of about 15 minutes, my entire SharePoint web site and sub-sites went read-only. A user was maintaining a library, deleting and adding files, and somewhere in that time span she lost the ability.

I was logged in to the server via RDP but wasn't running any applications or making any changes. If I log in to the SharePoint site as the super-dooper farm administrator user I can't make any changes either. I can't find anything in Central Administration that is preventing this. If I try to open the site in SharePoint Designer 2010 I get "you do not have permission to do this operation". SharePoint Designer is definitely enabled and was working previously. All services and application pools are running. Health Analyzer complains that "The server farm account should not be used for other services", "Databases exist on servers running SharePoint Foundation", and "Missing server side dependencies". Those "problems" have existed for months; I've had other priorities. The content database is 2 GB.

Oh, and I did reboot the server.

What could possibly cause this??

 Trying to edit a library item
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Are the content databases in read only mode? (SQL)

Is the site collection locked in read only mode? (Quotas)

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JonFlemingAuthor Commented:
Wow, that was easy; the site was locked in read-only. Don't know why I didn't look at that, but there sure is a lot to look at in Central Admin. Thanks.
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