[SOLVED - Re-installed Windows10] I've come across a problem when using CloneBD (ver 188.8.131.52 64-bit) to compress a backup of a Blu-Ray ISO file down to a BD-25 ISO. If I select original audio the compression takes place without any issues and I average about 314fps. I have nVidia CUDA acceleration enabled for encoding and decoding. However, if I select to down convert the audio either with the options 'down convert HD audio' or 'convert all audio' and selection of any codec, channels or bitrate, the compression takes place, but within a few moments the fps count starts to drop from around 400fps and continues to drop until my PC struggles to do anything. If I abort the process when the fps count starts to drop, eventually CloneBD will abort the process. Typically, if I wait just a little while, I see fps drop down to 50fps and continue to fall. At this point CloneBD will only be about 5% into processing the ISO file. CPU usage is high at around 90%, Video decoder input, Converter input, Encoder input and Encoder output are all 100%. If I wait too long it takes an absolute age to abort the process and during this time my PC is very sluggish. I have tried with three different untouched Blu-ray ISO backups made with AnyDVDHD and see the same issue. The backups themselves play fine. Something horrible is happening when down converting audio. I have not experienced this issue before because I normally leave the audio alone. I have a log file made at the point I aborted the process which is when the fps started to rapidly drop. I don't know how useful this will be. Thanks in advance for any help.