Besides the delay started giving strange errors, the case that had been repaired only by deleting the temporary files folder PD13 and reopening the project or return to the previous AutoSave Project.
I do not use Render Preview, in his place I use Produce Range, is fast.
That is why I would like to disable this feature. AMD-FX 8350 / 8GB DDR3
SSD SUV400S37240G / 2-HD WD 1TB
AMD Radeon R9 270 / AOC M2470SWD
Windows 7-64 / PD16 Ultimate