actually, this is a change of topic @stinky and you'd be better off reposting in a separate thread to get the replies you need.
however, 'groups' is a no-no class name when used in addons there are *many* of them out there using it wrongly. The problem you have is you're pulling an addon that hasn't got this classname in it, followed by one or more that have.
put simply, it's an addon conflict.
post your mission into the beta beta forum and we'll have a look at it for you.