Yep, it was me who pointed ace to this forum because it is the support forum for software from Unsatisfactory Software. I just made a quick internet search, so I hope I was right about that.
I agree that a crash log would be better send by email because it is very long but it's better to be posted here than never told to the author at all.
Now to the bug: The videotex.datatype should not be part of the crashlog because the Mason-YAM-theme does only contain PNG images (I didn't checked that). So it looks like the videotex datatype descriptor thinks one of the files belongs to him which is not correct.
To reproduce the bug one would have to download the
Masonicons - YAM, install the
videotex datatype and display one image after the other with eg. multiview which should trigger the same bug (because YAM uses the datatypes system to get the images).
I can't do it because I don't have OS4.