Allowed memory size exhausted

Hello,
I use the nextgen-gallery for my homepage, but since the last update I have a bug.
I can't work on my pages or posts while the plugin is activated. This message is shown:

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 491520 bytes) in /www/htdocs/w00eb917/csv/wp-content/plugins/nextgen-gallery/admin/manage-images.php on line 488

if I deactivate the plugin, work on my page and activate it again everything works fine, but I think that shouldn't be the normal way to work.

can you fix the problem?

greetings,
pia