Flickr Server Error - HTTP Status 500 - how to fix?

Hi,
Just upgraded to Photoshop Elements 11 on a x64 Dell running Win7. When trying to share photos using Flickr (which worked previously), I get the following:
Any idea what I can do to fix this? I've tried resetting accounts in Adobe Partner Services, Clearing Online Service Data, and refreshing the list of services - but makes no difference.
Any help very much appreciated,
Dan.
(Here's the text from the above, for search engines to chew on:
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
java.lang.NullPointerException org.apache.jsp.csp.error_jsp._jspService(error_jsp.java:197) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) com.adobe.ols.service.pseflickr.SessionFilter.doFilter(SessionFilter.java:80) com.adobe.ols.service.pseflickr.NoCacheFilter.doFilter(NoCacheFilter.java:56) com.adobe.ols.service.pseflickr.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:48)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.28 logs.

Hi,
Thanks - I've cleared my browser cache, and tried all the other things available here too, a couple of days ago:
http://kb2.adobe.com/cps/403/kb403064.html
When I tried it, it made no difference. Ironically, just using the Flickr service today 'just works'. Server side, as you say, so maybe something got restarted / fixed?
Given the entire forum web site wasn't accessible yesterday (and that appears to run on Tomcat, too) - perhaps the restart of the one is linked with the restart of the other.
Anyhow - problem solved - thanks for your support!
Dan.

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