Multi Vendor Does Not Work Properly

Multi vendor not working properly if one vendor is adding a product the other vendor cannot add a product or make changes please help how to solve this issue and using Version 4.4.2 Before everything was fine . Really need community help

Multi vendor not working properly if one vendor is adding a product the other vendor cannot add a product or make changes please help how to solve this issue and using Version 4.4.2 Before everything was fine . Really need community help

Please provide us with more details about this issue. Do you see any new records in the server error logs?