[Plugin: Nextgen Gallery] 0 Images uploaded after hoster change

Hello,

Iam working with this problem since the whole day and now i have to give up. I just changed the webhoster but didn’t have any problems getting the wp site back.
But when i wanted to upload a picture it just said “0 Images were uploaded” and no image appeared in that gallery. However, i tried different pictures which i had uploaded successfull before, but same thing, also in other galleries.

So i googled and tried all those different kind of solutions that were suggested:

– change permalink to postname and clear cache
– deactivate all plugins and try to upload just with next gen plugin activated
– set whole gallery folder to 777 permission
– set default template in wp
– update newest Next Gen version
– update to newest wp version
– create a new gallery and try upload there

but none of them worked for me.
so i have no clue what i could try now, i didn’t reinstall NextGen yet since iam afraid that all the galleries and images could be gone, with such a fresh installation.