Unable to uninstall module

The best way it to understand why this happens on your site although it does not happen elsewhere, and this means understanding why there is a 500. Can you look into your error log (typically /var/log/apache2/error.log for apache and often /var/log/apache2/php_error.log for PHP). The exact location of your PHP error log is defined in your php.ini, usually located at /etc/php5/apache2/php.ini, for the "error_log" parameter: this should show you an actual error instead of just the WSOD/500, which we can then use to locate and fix the problem.

No more details ?

@cesareaugusto, try to run cron and clear the cache. That should fix the problem.

I had a problem uninstalling 7.x-3.x-dev after I broke a few things. None of the solutions mentioned in issues helped me. I installed 7.x-3.0-alpha1 and was able to uninstall and re-install the module. Now I am back to playing with the ads, although with alpha and not rc1 or dev.

OK, if you cannot provide more detail about the actual problem data, there is no way it can be examined in depth, but there was a possible error condition when uninstalling from the UI instead of drush, which is fixed in today's dev. version. I assume this is what happened to you: can you check with that version ? There are a number of significant fixes since rc1 and even more since alpha1.

Good to know, thanks for confirming.