Hiya, I'm running DVDSpro 4.02 and am trying to create a final build of a dual layer project I'm working on. After finally sorting out a number of previous errors I've encountered a new one that I have no idea how to get around it. Today is the first time I've received this error. I've made a number of builds in the past few weeks and not received it before. The error, as the subject states, is "Internal Muxer Error". It's at the point where it's compiling VTS#5. The log shows that it passes writing the VOB file OK but then fails on the Muxing VOB File part. Any thoughts? <RANT> I'm getting so sick of this project now... I just want it on a disc and be done with it! Initially I had terrible problems building the job. It'd run for nearly 24 hours and then error on the encoding. I then split the single video file into 2 parts but got the same error. But at least I had 1 file of 2 encoded which made the next tests quicker. I eventually ended up splitting all the footage up into 30 minute segments, making new AC3 files, placing all that into my track and still got the error when building but it was on the last segment so encoding for all previous segments had worked. I then suspected drive space could be the issue and after carefully removing unwanted render files from my Final Cut Pro project the job finally built!!! So the "Encoder Error" message was simply that there wasn't enough drive space to continue encoding THEN make the build. I wish it was SMART ENOUGH to simply tell me that!!!! Coulda saved me a few weeks of failed nightly attempts at building. Looking at my ext. FW drive I still had 9GB of available space so I thought I was safe... but in my calcs I wasn't including the encoding that was required first. The next error was "Marker position in movie not at GOP Boundary" I tried resaving that specific footage (with the offending marker) out of FCPro but I'd get the error again from time to time. Funny that when I first bring the footage into DVDSPro I could run the build without the error but after it had tried to encode and got the Encoding errors, the next time I tried to build it'd say the marker was orff again. So for a while I was having to delete all the video/audio from the track, remove all markers, replace all audio/video then drop all markers back into my stories before I could happily try my next build. A workmate suggested that I delete the marker in the track and set it back with a DVDSpro marker instead. It worked (saving me 5 or more mins of rebuilding) but I may still get the message again on next build and I'd also kinda like to know why it was failing. Anyway, that's where I'm at now... with the STUPID muxer error? but no doubt it's probably STUPID me who did something to cause it.... Thanks for listening! </RANT> Cheers, Coj