I'm trying to list 600 products in Magento M2E-Pro, but the progressbar is stuck at 0% even after 1 hour. Waiting a huge amount of time I can see in the Amazon inventory about 400 of 600 products, while in Magento M2E-Pro all the products are still marked as "Inactive". Very strange behaviour. What I tryed so far: Checked the execution time of the PHP on the Server. As I work with less amount of products no problems. Am I missing somthing in the configurations ?
after long research, I found that in the table m2epro_lock_item the was an old dataset, which locked the synchronization. I clened this table and it works again :)