Textures failing, not saving in the model

Hello! since yesterday, it does not matter what kind of block i do, not even a single block is getting save the textures, i have been working over 5 months with blockbench and never ever happened this before, i mean often could be any missing textures and so, but now not even a single block with same colour in all the sides.... I uninstalled Blockbench and install again but continue happening. Does someone have same problem? does anyone know how to fix this?

Thanks