No Paste In DW

Within a DW document, I block and copy some text that I want to move to another place in doc. DW will not allow drag and drop. I try paste. No dice. I try cut and paste. No go. I open Note Pad and the material pastes.

I recreate DW's cache. Doesn't help. I unload and reload DW. Didn't help. I restart my computer. I restart my DSL/WIFI router. DW still refuses to paste from the Windows Clip Board. I close DW again and reload. From the loading screen I notice that it just flew by the loading of the cache. Suspicious already.

But I open the doc I'm trying to modify, block and copy to the CB again, and then open a brand new, fresh HTML document. No paste.

I had this same trouble months ago. Forgot what I had to do. Mad as hell at DW. Can't find the info in the threads. Will somebody please tell me what to do and why the dickens DW goes off on these weird tangents in the first damn place.