Demian Gutberlet, if I remember correctly you said that with 3.1.1 a (big) reflection improvement was on included, is this correct?
I'm rather sorry in case I would have made any false promises - feel free to let me know where I've written that as I cannot fully recall stating any major reflection improvements with this specific version, but it's always an ongoing topic of course.
I was wondering if there's any news regarding this bug: RE: Asset can not be placed
Please kindly refer to this thread here, more specifically to my last response in that thread. A user already stated that the Service Pack update resolved their problem, so feel free to give it a try as well and kindly follow the rest of the instructions I've written down otherwise.