I’ve uploaded two plug-ins which should fully work with Mavericks (on a side note, the old plug-ins still work fine with Plogue Bidule, it’s just Audiomulch and Reaper that exhibit identical issues.)
A 1st, 2nd, 3rd and 4th order 5.0 ITU decoder is available and should demonstrate the fix (and I’ve made it available for PC too!) Available on the WigWare page, or below!
As has been reported around the interweb, OSX Mavericks update stops the GUIs from a number of VST plug-ins functioning correctly (they don’t update when they should). The WigWare plug-ins are also affected by this issue. I have developed a fix, and will try and update all the software when I get a chance. In the mean-time, if there is a plug-in or two that you really need updating first, just let me know!