Well this doesn't sound like a good update at all!
The best thing to do is to get in touch with the developer and let him know your disappointment in this new update......if enough people do it, the Dev just may change this back again.
If you still have the old version of Viber in iTunes and haven't updated it there, then it is possible to put that version back on your iPad. Having said that the update may need to be done in order to run smoothly on IOS7.
Ayrshire - thank you for bringing this to our attention, I've been away from home, so mine hasn't updated as yet.
scbell99.....Hi and welcome to the Forum! At least you should be able to 'save' those photos first before deleting your history....it's something at least!