For More Information see: Using PHP and ODBC with FMSA 11 causes long fields to be truncated to 255 chars
This is one of many acknowledged bugs that can be found in the Known Bug List thread here in the Report an Issue section of the forum.
It can also be downloaded as a database file from: https://www.dropbox.com/s/jt09b82i0xijbu3/FMP%20Bugs.zip
Thanks for getting back to me.
It seems strange that they mention a way around the bug in the odbc instructions but it still does not work
Note the word "may" in my previous post.
I suggest reporting this in Report an Issue to see what the TS folks have to say about it. Perhaps you have missed some detail or perhaps this is confirmation that the bug still exists.