"Add to cart form" option not available in manage display
In the >content type > product display > manage display the option "add to cart form" disappeared. There are only SKU and Title with and without link.
Everything worked fine before.
Only reason I can think of that might have been the problem was an update of views 7.x-3.3. Downgrading to 7.x-3.1 did not solve the problem.
[Update] Resolved: Problem wasnt Views. it was the disable developer modules from the admin taskbar. it somehow disabled some modules.