Thanks for bringing this to my attention; it seems something has broken with the vibration button between v3.07a & v3.08. I am working on it now to get it fixed asap.
In terms of the 32 bit version it looks like it is not supported on newer MacOS's. So it is strange that this works at all. In saying that, I have found a way to make iVIBRATE 64-bit version, so once I get this bug fixed I will update iVIBRATE to 64-bit with the next patch :)