After I install the devel module I can no longer configure any blocks, I get an internal server error. I uninstalled and the issue stopped, re installed and its an issue again.
Furthermore, I cannot see the grey box in the lower left hand side of the browser where I can access all the variables available in a given page. This is the main reason for attempting to use the module. The module is successful in printing all SQL queries at the bottom of the page however. Any insight as to what might be wrong?
Update: I can also no longer uninstall the devel module from within the drupal backend, i receive the same error when trying to access the uninstall page, I will have to remove it manually from the file system
Update: Removed the devel module once again and problem is gone...