I too am having this issue. I have a dirty Win10 pro 64bit slightly oldish home built desktop with 2nd gen i5 proc, 8Mb DDR3 ram and a 1Tb HD, ATI Radeon HD4600 PCI video card. I have been running Roxio Creator 2011 flawlessly for yrs, then Win 10 took over and Creator 2011 was not happy. So I figured it was time to update and did. I am trying to import files from a Sony Hd cam where the codec is AVC and the file is .M2TS which works with every other program on my computer, mostly free ones and is also listed as a compatible file format. I received a similar response from tech support to try another format such as MPEG and I did try MPEG 4 and still no audio. Hoping for a bit more detailed input from some of the Guru's on this forum.