CMS Made Simple Forums

So I went ahead and went for the upgrade.  I got no errors, everything seemed to go smoothly, and it gave me a success message and links to the site and the admin section.

The site itself is fine, but the /admin/index.php is blank.  Page source is completely blank too.

Any ideas what could be causing this?  I've had no luck with anything turned up in a search.  Thanks!

Same here....

It looks like PHP runs out of memory while processing the page.
Make sure your PHP memory_limit setting is at least 16M.
Check the webserver logs for errors/clues on what goes wrong (or set a higher error_reporting_level so you actually see error messages on screen).

Finally found something that worked, posted by hotze;

As a follow-up I promised to add the solution: Problem was a modul (namely the FormFeedback). After renaming this module everything worked like a charm.

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Have to test if everything is working ok, but at least I can enter the admin-section again. (sigh)

Indeed, it could also be a module that is not ready for 1.x causing a fatal php error.
To be sure, check the webserver log (or set a higher error_reporting_level) to see if the error says something like "memory exhausted" or if some module is generating a fatal error.
If it's a module generating an error you can also find out by renaming all non-standard modules and renaming them back one by one.

I just renamed the module FeedbackForm and installed the newest one. For now all is working like a charm 

Bingo - it was the FeedbackForm module.  Thanks everyone!