Custom exporters reference getting lost

Hello there!

For some months now I have implemented a pipeline using sampler and so far the experience has been very cool, but there is a small problem that is bugging the team. I created a set of exporters for our inhouse engine but every time that I restart Sampler, it seems like the reference to this exporters is lost and it exports the wrong textures (btw we dont move the location of the files or anything like that). The only work around that we have found is to reimport/replace the exporters every time that we lunch Sampler, but it would be nice to get rid of this extra step. 

Thanks for your time!