I support a shop that sells services and stock / background wallpaper images. when uploading stock images i get a error max filesize directive exceeded amd I cannot find a setting in the software for it, has anyone seen it?

Tell us what type of images you want to upload? Ads? Product option upload?
 
If Ads You should type max size of files in admin/admin_ads_images_settings.php
Maximum filesize in bytes for small and big images.
 
If you looking something diffrent You should search filesize viariable in your database.
Database Table:va_global_settings
Contain image_large_size and image_small_size values
which normally You set up by admin/admin_ads_images_settings.php page.
 
Hope it help
Szymon