There are some changes between v13 and v14 and my guess is that the v13 WD engine cannot handle all v14 features in a 1:1 manner. If you edit DBs in FMPA v14, using FMS v14 is recommended.
Yep true, thnx for replying. It's clear to me what's happening: When you save a layout in FMP 14 it converts and saves the current theme as a FMP14 theme. This adds (amongst other things) placeholders styles to the theme. The problem is that WD13 cannot handle these placeholder styles. That WD13 then doesn't ignore but uses these styles as the text style of the fields is not great.
But i get that it's a forward compatibility issue which is low priority and unlikely to be solved. I mainly started this thread so other developers who searched for this issue could find something.
I considered WebDirect as "not finished yet" with FM13.
I would be cautious with WebDirect even with FM14. There might still be lot of room for improvements!