OS X :: Snow Leopard Drag And Drop Broken (85 Object Limit)?

Normally consider myself quite able to troubleshoot my own problems, but I can't for the life of me figure out what to do here, and can't seem to find many others who have the same problem. The drag-and-drop function in Snow Leopard appears to be either broken or deliberately crippled. My work sees me having to move a lot of files from folder to folder, and I've discovered that, as of fairly recently, I can no longer drag-and-drop more than 85 objects from one folder to another. Up to 85, everything works just fine -- but if I select 86, upon dragging I get an "X-ed out" icon, like the "no smoking" or "no parking" circle with a line through it.

I'm not quite sure what to do about this, but would be very curious and appreciative if anyone else has the same issue, or has figured out how to solve it! This, combined with the lack of a "cut" feature in OS X has begun to really impede my workflow.