As there's been no response from Avast for my two false positive reports about this (no acknowledgement email, no email reply)

Haven't seen it reported by anyone else yet...
Every time I try to run create a Rescue Disk, I get the error message: We failed to create a Rescue Disk.
I updated to this version using the update process in Avast on three computers. all were updated successfully, but on two computers ( I haven't tried the third computer yet) I cant create a rescue disk because Avast is saying that imagex.exe in the Microsoft folder at:
C:\Program File(x86)/Windows Kits\8.0\Assessment and Deployment Kit\x86\DISM\imagex.exe
is malware/Ransomeware/a virus and that it's trying to access/overwrite sensitive files.
This is the Microsoft Imaging Utility.
I've scanned the file with AVAST and Malware Bytes and both say the file is OK.
I've tried temporarily turning off Ransomware Shield and Sensitive Data Shield, and loaded the file as an exception, but the problem still exists.
I've also sent two false positive reports to Avast about this file and the error.
I've also run a Repair App from the troubleshooting screen and that hasn't fixed this error.
Has anyone else had this problem with this latest update?