What tools didn't work that's not an issue, it just don't work in 32bit mode, maybe before you saved EXR as 16bit and all tools working and now you are saving in 32bit, many tools do not work in this mode, in last photoshop they even turn off camera raw for 32bit, but still there is way to use it. As for difference looking, 3ds max do not have color profile for adopting 32bit image what your monitor can't show you because it's work in 8bit. but photoshop have many color profile for working space and for your specific monitor so difference will be, also saving 8bit image for web also may be different what photoshop showing you