This has been driving me crazy. I'm tempo mapping a wave file, slide the wave at measure 84 and - BAM - right back to the start. Only started happening after last update. I thought I had set something wrong and couldn't find it. I just fired up Studio One 4, right clicked the timeline and changed it from "beats - linear" to "time - linear". Presto. Now if I can just glue back in all the hair I pulled out of my head.