' Error while creating additional image' in 1.7.8.1 after migration

[FonZ]

After migrating to another hosting company (and some serious headaches trying to get up and running again), I'm trying to add some new images to my shop and I get:

'Error while creating additional image'

In phpmyadmin I see that in the 'ps_image' table a new row is created where 'id_image = 0'. In 'ps_image_shop' I can find this reference, so the id_product is correctly tied to the id_image of '0'. I'm assuming the problem lies in the creation of the folder '0' in img/p/ but as stated, this is an assumption.

So based on the above assumption: how to get ps_image to increment the id_image properly? Is there something else I need to check or be aware of?

Any help is highly appreciated!