Hello,
I was very happy, working with Blender 2.56a/beta for some time.
As I tried to upgrade to 2.59 some weeks ago, there were strange results on simple keyboard inputs, like g for grab and other ones.
I didn't have time left to research this at that moment and went on with 2.56a.
Yesterday I saw, that 2.60 is available and I read about some exciting new features, downloaded it and had to face the same problems. This time I wanted to know more and after some hours of try and error I discovered, that the problem is connected with the ms-windows software for the support of disabled people (like me).
I cannot press 2 keys at the same time, which normally is no problem, because I can activate a feature in the ms-windows system and then press first shift or ctrl or something and after that the related key.
When this option is enabled, blender works properly for some (short) time. But at the latest after I tried to add something, blender seems to 'think' that the shift button is pressed all the time.
For example: when I press g the group menu is prompted.
When I disable this option, blender works well, but I am not able to use it.
It didn't occur in 2.56a, but in 2.59 and 2.60a. I did not examine 2.57 or 2.58.
I am very eager for the new versions and quite frustated at the moment.

I am working with
windows vista, home basic,
service pack 2,
on a
HP sr5704de,
AMD dual core-4450
2 Gb ram
Nvidia Geforce 9100