Yes, I did, mostly planar mapping.
Please remember that before adding the 3D text , the exported model looked great ( same geometry and also textured ).
The problem with textures appears after I added the 3D text
( My workflow for 3D text was -> Create - Text (as Poly) - I selected the faces of my text - extruded them - applied a texure ( a jpg file) on them - I deleted the edged from my 3D text because I moved the extruded text to the right position....that the rest of the workflow is mentioned up...
Maybe here appeared the problem, I`m not sure..

Thanks !
Ionut