I have been working on a document for several hours. I set auto save at 4 minutes and got a popup every 4 minutes with the save address on it. At the end of that time I closed the system down, came back later, opened the file and nothing had been saved. I looked in the default save location and the file was not there either. This is a serious problem. I have raised the issue with my reseller but not sure what they can do. Anyone else had this problem ? PTC needs to look at this. I noticed the save address on the popup said Mathcad 14. I have Mathcad 15. The reseller said this could be the problem but offered no solution.