I have never been able to activate the snipping tool when GameGuru is in the full screen mode (a test run) we have no access to that tool in the test run only in the editor which means only a screen capture of the map.
The easy way is to just use bandicam or Frapps
Example using bandicam for screen shot and or attachments
Windows pro 8.1 with 8.1 update,64 bit|AMD FX-6200 Six-core-3.80 Ghz |CPU PASSMARK 6,142 |Memory 10GB |NVIDIA GEFORCE GTX 660 SC |GPU PASSMARK 4,114