Win7 Pro 64Bit MPCStar 5.4 with TigerPlayer v188.8.131.52.8 hiccup every 30 seconds. The same file which play by Real Player is very smooth without a hiccup. My experience is that the newer version of MPCStar the worst. When I start using MPCStar back in 2006, it is lighting fast to launch the program and playing very smoothly for RMVB. After it supports MP4, performance downgraded. Take long time to launch the program. Requires higher end CPU to run the program smoothly. Is there any update codes? I remember last time have to install k-codes to fix the serious hiccup problem.