Presonus Studio One Pro 4.5
Export Mixdown used to work fine. Now, the result sounds like a very short delay of the same signal has been added; like a flanger but with no "sweep". I closed the program, reopened it and tried again. Same result. Tried .wav and (320) mp3. Same result on both. Multitrack playback sounds fine from S1. The mixed file sounds "flanged" when I send it to myself and play it back on a totally different system.
I can't mix anything (except clumsily, via my interface and back into a stereo track in S1) until this gets fixed.