A customer have been using workflows for a while on one of their sites but now want to remove them. For some reason this is not possible. All the defined workflows produce an "Object reference not set to an instance of an object" error message as soon as they are clicked in admin mode. I have seen that similar cases have been reported in the forum, but only as an effect after an upgrade to 4.50. The reply from EP states that this is a known bug that has been corrected in 4.51. Ver. 4.51 is the version for this site, so this should not be happening...Help appreciated :)