I know many of us are experiencing the same VOX problems eg, we can't position or remove images in our editor box and our posts are disappearing etc... I didn't experience these frustrations before I switched to Firefox 3.
I wrote to VOX and this is their response:
We're sorry you're having trouble using Vox. Currently, we don't support Firefox 3 but we're always working towards making Vox a smoother experience for more members. Thank you for your patience while we work on this.
In the meantime, you might want to stick with using one of our other supported browsers, like Internet Explorer. We're sorry for any confusion or inconvenience.