The table you are looking at has a problem wrapping text. You can clearly see that in the header:
I merged all four cells in the grid's header and then plopped a label into it and added the text "Business Activity Details". But it seems to think it has to wrap the text where the right edge of the first cell used to be (as if it's still there).
You can see this in the last two rows as well. In the third from last (where it starts with "Class 'E' preference shares:") I tried checking "No Wrapping" in the General tab of the label properties, but as you can see, I DO want wrapping (otherwise the text goes off the edge of the grid), just at the right edge of all four merged cells.
I just switched from 4.2.2 to 4.3.1 for testing and development and just came across this same issue.
I have narrowed it down to affecting both Grids and Tables. But for me so far it seems to only happen when the columns have been been given a specific width instead of them staying auto.
I have found a work around that seems to work, I have to select cells that have been merged then under Property: Text \ Whitespace: set it to Preformatted instead of Auto.
Just a pain now to open all of the reports and make this changes. Fortunately production is still running 4.2.2
After further testing you are correct, there still seems to be a problem here. My previous observations was incorrect since the test data I was using wasn't long enough to show the clipping.
If the first column width is set to auto in the merged space, it fills the merged space and wraps correctly when setting Property: Text \ Whitespace: Normal, and clips when Property: Text \ Whitespace: Preformatted / No Wrapping.
However when setting the first column in the merged space to a fixed width, things start to have undesired results.
Looks like there is also some other issues with Merged Cells. When merging vertically instead of horizontally we also get some unexpected results in version 4.3.1 works fine in 4.2.2
When the Column is auto width there doesn't seem to be an issue, however when the column is fixed width there is an interesting issue. The cells in then next column to the right have an unexpected right padding added to them, however it doesn't affect the first row of the merged space only the subsequent rows.