wilsonbry
I had the same problem. So I did the following, which might be dangerous, but until the dokuwiki team provides a better solution, this worked for me:
On the file doku.php, on the first line starting with "<?php", replace it with "<?php ini_set('display_errors', 1);"
then next time you access your wiki you will get the error message with what breaks. Here I saw that the nbsp plugin was breaking it, so I added "$plugins['nbsp'] = 0;" to the file conf/plugins.local.php.
Then after trying to access the wiki again I got an error message related to the plugin "translation", so I added "$plugins['translation'] = 0;" to conf/plugins.local.php
then it worked... give it a shot, disabling plugins that break one by one this way.