This morning some users logged in to find their workspace URL resolve to an old welcome page, which looked like this:
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It works!
This is the default web page for this server.
The web server software is running but no content has been added, yet.
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We have resolved the issue. User content was never compromised and service should be fully functional, now. If you see this message or one similar, please perform a page refresh and if this does not resolve it, contact Support at support@pbworks.com with the workspace URL.
PBworks Official Blog 
I got scared for a second there! It has been a couple months since I made a full backup.
Next question: Why am I getting this error whenever I try to open a file in the library?
“No preview is available for xxx.pdf. To view it, click the “Download” tab above.”
Is this a symptom of this problem, or something else? I don’t see a download tab….
I am using Chrome browser. Do I need to switch to a different browser?
Is there a way to get a PDF or DOC file to appear when we click on it, without having to perform a download?
For technical support, please contact Support at support@pbworks.com.