Hi Greg,
Issue 1: (Merge)
---------
I was not able to reproduce the issue. I created a sample to merge 4 cells 3 times in the same row and merging works fine for all ranges. Here is the test sample that I used to test this issue:
http://websamples.syncfusion.com/samples/XlsIO.Web/4.4.0.51/F61202/main.htmCould you please take a look at the sample above and kindly let me know if you still find any problem, if not could you please modify this sample so that I can reproduce the issue? This would help me in investigating this issue further.
Issue 2: (Merged cell with DataTable)
--------
insert:copystyles is used only to copy style from the above row or left column. But it is not possible to duplicate the merge every row. And also, currently it is not possible to duplicate the merge every row by using template markers. Sorry for the inconvenience caused.
Kindly let me know if you have any other questions.
Thanks,
Melba