I haven't seen this mentioned before, if it has been then I am sorry. I will try to articulate the problem best I can.
I noticed last month that when I did a PQ of Michigan placed caches by date. It would have problems if I accidentally selected more days than there actually are in a month. Previously the program would automatically correct to April 30 if I accidentally clicked April 31. It no longer does that.
For example, when running a query for Feb 01, 2010 - Feb 28, 2010 it would show 446 caches placed
Feb 01, 2010 - Feb 31, 2010 returns +500 caches placed
Feb 01, 2010 - March 01, 2010 returns 461 caches placed
I know this isn't a big problem and is easily worked around, just a heads up for future update.