SONARPDR.EXE crash / hang problem

 Hi, While working on some simple projects in Sonar X1 using a couple of instances of Dimension Pro VST Plugin (64 bit) my app keeps freezing then I get an error message about SONARPDR.EXE not responding and I have to close the program - losing all unsaved work! My original installation was upgraded 8.5 to Sonar X1, then Expanded with patches up to X1c. But I got so frustrated with the constant crashes (every few minutes), that I wiped entire Win7 OS and did clean reinstall, downloaded all the latest bits from Cakewalk and re-installed Sonar X1 with patch X1d - yet still get same problem! Can you not run a few seperate tracks with the same VST plugin, I need to access the great library of different sounds and use them simultaneoualsy to build up my compositions?! (i.e. DiPro on a few tracks with different sounds? (I noticed that if I froze one DiPro track I could get away with working on another one and so on - but that is a really tedious way to work and not why I bought this kind of software!) Has anyone had similar problem and managed to fix it? This is driving me nuts as I have a really important job on that I needs me to be working creatively not as a problem solver! Please help if you have any ideas, I've been trawling the forum but not found anything that quite matches my problem Thanks