I've got the exact same problem, i find the files im looking for but cant recover them :|
i tried an earlier version and everything worked fine, the files that recuva v.1.26.416 finds does recover the way they should even when found on a flash drive. but the problem with that version is that it doesn't find the files im looking for
ps. i couldn't find any version between v.1.26.416 and the newest version to download so e.g v.1.35 might work i cant know for sure
pss. the file im looking for is potentially evidence in a lawsuit