Some Correspondents using Mavericks are reporting that downloaded scripts are regarded as damaged by the OS. I suspect it is a codesigning issue. This doesn't affect downloading to systems before OS X 10.9. I'm investigating and testing to rule out other possibilities.
UPDATE (4:15PM): Looks like this is just affecting Remove n Characters From Front or Back v4.7. Mavericks wasn't happy with the way it was packaged. So I recompiled, rebuilt the .dmg, and re-zipped. That script should be fine now. Wish I could say I knew for certain that it's the only one affected.
UPDATE (4:45PM): Looks like Save Album Art to Album Folder, one I posted today, is also corrupted in Mavericks. I've fixed it.