Gramplets showing default image for thumbnails [ new warning message: derived class Glade shouldn't use slots ]

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Hi @Rick.Allen
This sounds exactly like a problem that is scheduled to be fixed in the next release.
It is also reported in these threads

and the planned fix was discussed here
Fix imagethumb savev() passing strings instead of lists for array args by dsblank · Pull Request #2204 · gramps-project/gramps

@Nick-Hall do you have a date in mind for the next release?