Ok, I took the Steiner example and modified this line:
STAMP_ADD (28.0 31.0 "1 C" " " "" "" "This is center text.\nLet's see how it works.\nIt appears to be taking up a lot of space." "")
Actually, there is a very simple fix, with a slightly less simple explanation.
The fix is to remove the 2 extra sets of double quotes between "1 C" and "This is ....".
STAMP_ADD (28.0 31.0 "1 C" "" "This is center text.\nLet's see how it works.\nIt appears to be taking up a lot of space." "")
Prior to V3.8, the STAMP_ADD command required three text items for three lines of text inside the stamp, and another three text items for under the stamp for a total of six text items.
As a way of simplifying the command, while at the same time adding functionality the STAMP_ADD command now requires only four text items; one for inside the stamp and three for under the stamp. It also now processes "\n" new line indicators inside text items to generate multiple lines of text inside or under the stamp.
However, in order to maintain backwards compatibility with older albums, if a STAMP_ADD command has 6 text items, it is processed in exactly the same way that an older version of AlbumEasy would process it. If it has 4 text items, it is treated as the new command.
I was considering issuing a warning if older syntax was detected, but with older albums containing hundreds of STAMP_ADD commands, the user would be absolutely swamped by the warnings so decided not to.
I had thought that I had updated all the example files to use the new syntax, but somehow I must have missed the Steiner example, I better check them all.