I've always assumed that this problem is a general feature and not specific to me but as I've not read of any similar problem thought it best to ask.
When using MBL 2.5 which I find a really good product, there is a problem if you try and copy a clip and then "paste event attributes" to another clip.
MBL is applied to the clip but your chosen preset isn't. It appears in the dropdown box as selected but it's not actually applied. If you simply select another preset and then reselect the one you want, all is fine.
This is not a good work around when you want to apply a grade etc to 100 clips.