Hello Mr. Henriques,
It seems that you have used Mosaic blending mode for orthophoto generation, while the previous one was generated using Average blending mode (the only one supported by 0.8.1 version).
In the Mosaic blending mode image details from overlapping photos are not mixed, and are extracted from one photo for each image region. The colors are also currently extrapolated to untextured regions of the orthophoto, which may be confusing so we will probably remove extrapolation in the next update.
If you think that the textured part of the orthophoto has problems, it would be great if you could send a higher resolution image demonstrating the problem to support@agisoft.ru.