Hi,
I reported similar before:
if I load the korg M3 vsti (only for controlling the synth) into Renoise using the bridge, the plugin will hang on a popup dialogue requester (it will always popup after start, saying it searches now for the device), the cpu goes up to 100% and you can only force quit Renoise then. It runs in Renoise 32bit unbridged.
You can download here and test:
http://i.korg.com/uploads/Download/M3Editor_mac_221_634184189705510000.zip
Here some collection of similar, maybe related bugs regarding OSX bridge:
https://forum.renoise.com/t/some-plugins-tooltips-not-working-when-sandboxed-bridged/46485
https://forum.renoise.com/t/crash-osx-using-combi-64bit-synth-bridged-32bit-synth/46457
https://forum.renoise.com/t/bridged-plugins-slow-down-renoisegui-w-open-save-modal-dialog/46159
https://forum.renoise.com/t/osx-some-bridged-vst-32-bit-guis-in-64-bit-lag-a-lot/45660