@fingus & @eson, please do file bug reports, preferably at GitHub, so @nephros or @vlagged can analyse what is going wrong: They are the 32/64-bit mangling experts for Patchmanager.
Edit / P.S.: Maybe PM-PR #428, which fixes issue #426 resolves that; the ones affected by this might take a closer look at the issue description. PR #428 will be in PM 3.2.9, which will be released when it is ready (as usual).