Error message "MageBaseDps failed with exception - see exception.log" together with "Can't retrieve result from GET variable result. Check your server configuration" in var/log/exception.log

In the unlikely case that you see this error message, the most likely culprit is a too strict setting for php suhosin. Change your suhosin.ini to include the last line. The other lines are helpful when saving large amounts of data from the Magento backend bc.. suhosin.request.max_vars = 1500 suhosin.post.max_vars = 1500 suhosin.get.max_value_length = 4096