I met a problem when copy some lines in one buffer to any buffer. Here is the details.
For example, I use command '3yy' to copy 3 lines in buffer file1 and want use command 'p' to paste these lines in buffer file2. However, if I do a 'd' command between this two commands to delete some lines in either buffer, the 'p' command will not work anymore. It cannot paste the content I copied using '3yy' before. I am on Vim Window 7.