This is a frustrating error for someone who doesn't know much about DNN. ;)

I have a page with a custom module on it that allows users to select report options, then it shows an SSRS report.  We recently upgraded from 5.6.7 to 6.2(?), and now occassionally (1-2 times a day) see an error on the page.  The page itself loads fine, but instead of the module, it shows a red rectangle with the error message "An error has occurred.  Error: Report Center is currently unavailable."  But it usually works just fine. 

Any idea of what could be causing this?  My guess is that there's an error loading the module, but I don't know what the error is, so I can't fix it...or even try.

I checked the server's event viewer, and I find no entries near when I get the error.  I checked the report server database, and I don't see any database errors.  I did a folder comparison on the module in the old environment and in the new one, and those directories are identical. I searched the SQL database tables for parts of the error message, "An error has occurred" and "Report Center" and "is unavailable", and I only found one hit in the tab or tabmodule table for "Report Center".  The page works most of the time, so I believe the database connection strings are setup correctly.  The connections do have some pooling items in the connection strings, but I don' t think those affect anything.  And when these errors occur, I don't see a ton of activity on the server (2-3 users is all).

I found the icon that is displayed with the error message, error-icn.png, and I found that in the new DNNFormMessage Error class. So I searched all the files in the site's directories looking for anything that used that class, and I can't find anything. 

Any helpful pointers would be most welcome.

Thanks!