I did some testing with 32 vs 64bit renoise as my plugins are 64bit, but now all my plugins are wrapped and bridged.
If I use 64bit renoise, it will bridge plugin (->64bit) + same in 32bit version (->32bit).
Also when I open a song in 64bit renoise, which I just did in 32bit version and try to open plugin gui, I get this:
3670
log file just says I have opened —.xrns file.
I am on OSX 10.6.8 in 32bit boot mode, but Snow Leopard can run 64bit apps in 32bit mode.
edit. oh and latest 2.8.1 versions of renoise.