Ok
so it did it again today .
however there was no extra (new folder ) this time .
so i found a fix finally without even having to close sonar .
this is my fix .
1)As soon as insert synth is greyed out
2)go to plug-in layouts>C:\ProgramData\Cakewalk\SONAR Platinum\Plug-in Menu Layouts
so in there i have the following files :
default.pgl.tmp
EFFECTS.pgl (my custom effects all organised)
INSTRUMENTS.pgl (my custom instruments all organised)
Platinum Effects.pgl
3) drag out INSTRUMENTS.pgl file and put it on desktop.( you will now see insert synth is no longer greyed out )
4 ) get a saved copy my INSTRUMENTS.pgl , and copy it into plug-in layouts (((not the one you draged on to the desktop ))( which i keep on a separate hdd, every time i add new effects or instruments and save , i go into plug-in layouts and copy both files and keep a duplicate for many reasons ,this being one as it seems .
5)insert synth no longer greyed out and all of my organised instruments are back organised .
All the best hope this helps
p.s this has never happened to my effects file yet so im wondering if bad vst or something .