In fact all seems works normally. No problem with the editor. I can compile the sketch. And when i want to download it, i can see the the 'uploading to I/O board" and finally the "uploaded done" but nothing is done. The uploaded global time seems just to short as normal.
When you press the button to upload the sketch, hold on to the "shift" key. The tooltip should change from "Upload" to "Upload (w/ Verbose Output)". You will then see in the Output window all the commands that are being run. The last one (the one that does the actual uploading) should be avrdude.
Also, if you run mpide.exe from a Command Prompt window (if you can get one inWindows 8) you should be able to see all the debugging information scrolling up the screen. You may get some clues in there.