Thanks guys. Some info about this problem:
1- There are no text saved at all, on any of Xml files;
2- The problem isn't only about the text - some imported images disappears too, and the LO shows a red "X" on screen over those objects;
3- If I have some 4 or 5 objects from one or more big sketchup models, and some images and text, the problem occurs when activating the "hybrid" rendering on those objects - then some bitmap images "disappears" from screen - next time to try open the file, and LO shows this message then exit: "Microsoft Visual C++ Runtime Library - Runtime Error! - Program: (empty) - This application requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information". Even the debug window do not shows up.
The system is a XP64 still Sp2, with several GB of Ram, and LO never uses more that 1.5 GB.