I started with a magento 1.9.2 installation. It was possible to import/export the products with the magento funtion export/data profile/export all products.
A few weeks ago, I upgraded to magento 1.9.3. When I tried to export all products now I only see a white new tab.
After a few minutes I get an error message
"unavailable service due to .... or capacity problem"
I use magento 1.9.3 with mariadb 10.0 / plesk.