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Debugging "Something has gone wrong"

I am running 2.1.8p2 on an IIS server. All was running perfectly. Today, I saw in my email that there was a new thread started on my forum, so went to read the message. I saw "Something has gone wrong" on that posting page. I then tried to go to the top level forum page, same message.
I then edited the config.php file to turn debugging on. Now when I try and access the forum, I just see a blank page.
Ideas? Suggestions for further debugging? Thanks.
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Comments
Search for inspiration here: http://vanillaforums.org/search?adv=&search=blank+page&title=&author=&cat=all&tags=&discussion_d=1&discussion_question=1&comment_c=1&comment_answer=1&page_p=1&within=1+day&date=
But if you've seen something, then changed the config.php, and then you see nothing, you may have a typo in your config.php?
These are the steps you can try:
/!\ All of this could reveal sensible data so you might want to htaccess protect your side during that error search...
Update - please ignore. Probably was something transient with my ISP, error is gone.