When I am texturing a model in Photoshop, I can have a 3d model open in one tab, and the corresponding diffuse texture PSB open in another tab for more accurate texturing. However I have been dealing with this time consuming and irritating bug where the 2d texture and the 3d models texture seem to disconnect for whatever reason. For example I will be painting directly on the model, then go into the flat texture which is the same texture and make some changes to it. At first my changes will be immediately visible in the model, but some times what I do on the 2d texture just up and decides to stop updating on the 3d model Im texturing and I end up having to either start over again or save out the texture, close it, reopen it and import the latest texture back in. This is extremely frustrating and it happens on both Windows and OSX and keeps me from recommending Photoshop as a 3d texturing tool.