EastWest Hollywood Strings problems

Thanks. It seems to be something other than a disk issue. I have adjusted buffers and voices and sampling rates, no effect. The issue still happens.
I noticed that once an instrument stops working, the only way to fix it is to reload it again from the browser in Play. If you save an instrument that stops working in Sonar as another file and reload it, it still does not work. This is true if you are do so in the original sonar project or start a new one. This is true even in the stand alone version of Play. If you take the non-working instrument file you saved in sonar and load it into the standalone version of Play it will not play. It behaves the same as it does in Sonar, namely the midi signals are registering on the input but there is abolututely no output. If you load the same instrument from the browser or a file in Sonar containing a working version of the same instrument, into the standalone version of Play, it works perfectly.

This is a bit hard to describe but let's say viola 2 is working in Sonar. Unpredictably it will stop working; sometimes while editing, sometimes when simply when simply playing a track that uses viola 2. Nothing can make viola 2 produce any sound except reloading viola 2 fresh from the Play browser. If you save the nonfunctional viola 2 to another file, it won't work in Sonar or in the standalone version of Play. If you reload viola 2 from the play browser either in sonar or the standalone, it works. Reload the file with the nonfunctional viola 2and it doesn't work (ie. No sound output). If you save a working version of viola 2 and then reload it either in sonar or the standalone browser, it always works. Greatful for any thoughts or advice.

Many thanks