Yep, you definitely got a memory leak. I've had the memory usage jump by 10K just by opening and closing the database in succession. Also I've gotten the memory usage to jump by 10 - 20K just by going down the tabs in order on the database, then closing it.
So in other words, I could have MV taking up 200 K of memory, open the database and it will jump to 220K, then when I close it, it only goes back down to 210K. Next time I open it, it can then jump to 230K, then drop to 220K when closed. Needless to say, that extra 10K that is not being deallocated adds up fast.
By comparison, I have VX Ace open, and it has been using up a nice 78 - 79K for the entire day.
Edit: Can't find the screen to do the same copy/paste the others are, and the one I have shows my windows serial number, so I'll type them in here manually:
Spoiler
Intel Core I-7, 2.30 GHZ,
Windows 7, Service pack 1, 64 bit
12 GB ram
1 TB HD
Graphics Card: Intel HD Graphics 4000
Monitor: 17 inch laptop monitor.
Need more?