Unable for activities menu to behave correctly

[Βασίλης Τουμπακάρης <btoumbas gmail com>]

Hi, I have this issue with every gnome live usb. For example [1], [2].
My coputer has these specs.

Intel Core2 CPU  6300 1.86GHz || RAM 2001 MiB || ASUS INC. P5B-VM
nVidia G73 [GeForce 7300 GT] [10de:0393] {nvidia}

What causes this behavior? Is that solved? Thanks in advance.

[1] https://db.tt/cfuzVbv9

[2] https://db.tt/ITqF0Fi5