First of all you should ask them to let you use .htaccess and just create this file in your gallery root folder and add suhosin_simulation=off to it.
This will disable it only for your gallery but won't turn it off completely.
And this what helped other people usually.
Then, as I mentioned already - default suhosin installation (as it comes with latest Ubuntu atleast) poses no troubles to imagevue.
So either them admins overtighten security nuts and bolts after install, or those issues are related to some "increased security" linux distro where suhosin is pre-configured this way.
Unfortunately there are enough settings to destroy any web-application, so it's bit hard to tell exactly what's wrong, but atleast for some issues we tried to suggest what to disable. There are some posts in forum too.
Your issues are not related to suhosin it seems, first of all your gallery tried to load
http://www.phuongcostello.com/imagevue/ ... nglish.xml
which is not even there.
But actual file is
http://www.phuongcostello.com/imagevue/ ... nglish.xml
You need to change English to english in config.
I believe your best bet is to see if gallery works. Then .htaccess suhosin if you have issues. If this wont help, ask your friendly admins to actually enable .htaccess directives for your site.