from the desk of stinkpot

if you see the following error message when restoring a gallery2 backup:

Security Violation

The action you attempted is not permitted.

Error (ERROR_BAD_PARAMETER)

* in modules/core/classes/GalleryStorage.class at line 592 (gallerycoreapi::error)
* in modules/core/classes/GalleryCoreApi.class at line 2792 (mysqlstorage::getmapentry)
* in modules/core/classes/GalleryDataCache.class at line 628 (gallerycoreapi::getmapentry)
* in modules/core/classes/GalleryTheme.class at line 1135 (gallerydatacache::getpagedata)
* in themes/matrix/theme.inc at line 65 (matrixtheme::loadcommontemplatedata)
* in modules/core/classes/GalleryTheme.class at line 926 (matrixtheme::showalbumpage)
* in modules/core/classes/GalleryView.class at line 308 (matrixtheme::loadtemplate)
* in main.php at line 441 (showitemview::doloadtemplate)
* in main.php at line 94
* in main.php at line 83

try going into your g2data folder and deleting the cache directory.  worked for me.