Running Quicken H&B 2008 on WinXP Pro SP2, Pentium 4, 3 GHz, 1MB RAM.
Around H&B 2005, I lost the ability to copy & paste between quicken FILES, not accounts.
Attempting a paste in the destination file would result in Quicken spontaneously shutting down.
H&B 2007 R5 SEEMED to be more stable, but I had not really tested it.
H&B 2008 R2 DEFINITELY allows me to copy & paste individual transactions now.
Strangely, though, I can no longer choose multiple transactions to copy.
May be unique to my situation, but I am VERY happy to be able to copy transactions without re-typing them.
YMMV, Bob P.S. Killing this bug was, in itself, worth the upgrade price for me, but I would have upgraded even with the bug included :-)