Hi,
I just upgraded to Sibelius 7.5 from 7. When I did my Sibelius sounds for the winds stopped playing back. I checked my playback configuration and nothing was out of the ordinary to my knowledge. I've had the s7s template but never really used it. I have just stuck with the vdl template because it did everything I needed it to. I thought since my normal configuration wasn't working I would use the bundled template I downloaded from TWS. I followed all procedures to set everything up, however, when I load things the vdl sounds still don't play back. I have come to the conclusion that it will only let me have one active library open at a time. I figured this out because I would take VDL out of my playback and the s7s sounds would play. Then I would take the s7s sounds out and my VDL stuff would play. 
Any advice? 
All the .xml files are in their correct places. I am running:
Macbook Air
Sib 7.5
VDL 2.5.5
TWS templates - vdlsoundset7.0a and s7s_template7.1a
Thanks!