VirtualBox freezes, unfreezes after window resize

Did you install virtualbox from the ubuntu repositories? Or from the virtualbox website? And which version of ubuntu are you running?

I installed virtualbox from the ubuntu repositories.

Version: gutsy gibbon

I believe i can confirm this on Hardy with Virtualbox 1.5.6. I don't use MS Word myself, but Adobe Photoshop CS3 exhibits similar behaviour. Usually the window in question whitens out and displays a "not responding" text, though i can 'revive' it by opening a new Windows Explorer instance. In rare cases (about 1 in 10), resizing the guest window brings it back online.

I am using Shared Folders on the Hardy host which i think might have a role in the time out / not responding.

I experience the same and it doesn't depend on the program. The whole Windows display just freezes (sometimes it's a 2/3 screen wide horizontal bar in the middle that gets frozen or smth) and doesn't unfreeze until I resize the window.

I'm using a Core2Duo with GM965 chipset and X3100 graphics accelerator.

An by the way, I use version 2.0.2 of virtualbox-ose from the Intrepid repository.

same behaviour using virtualbox 2.02 PUEL (not virtualbox-ose) on Intrepid as well as on Hardy.
I'm using Dual Display and also GM965 chipset and X3100 graphics accelerator

As a temporary solution, executing following command in a shell window de-freeezes the virtualbox-window:
(I have not even to restart virtualbox)

$ xrandr

It's probably a duplicate of this:
https://bugs.launchpad.net/xorg-server/+bug/275285

For me, the problem went away with Ubuntu 8.10

Closing as "Fix Released", since it works for the original reporter.
If there's still a problem for others (in the most recent Ubuntu version), please re-open.