Equations in Office 2007 cause errors

[Alex]

Hello,

I'm using equations in MS Office Word 2007 often. But many themes, usually
as I use more in one document, Office seems to be unable to save my documents.

How to reproduce:

- Create a new document and save it.
- Insert a few equations (formulas).
- Try to save the document.
- Office prompts to choose a filename (Weird because it's already saved).
- OK, you pick a filename and then you get the errro: A file error has
occured. And the box closes after clicking OK.

In Office I cannot align (center/left/right) anything after a certain point
(same point when you can't save anymore).

Very annoying error.
I did install MS Office SP1.

I get this error on every PC (Win XP Pro).
Anyone knows a fix?