Hello, Since yesterday, the application has been giving me trouble. 1: At pos, when you click submit to process payment and prints receipt,it will show loading for a long while then the screen goes white. if you refresh the page and try submitting it again, same thing happens. Problem is the number of times you try refreshing, it will record all the attempts as sells with payment "due" by them.

2: Other times am looking for a pos sales invoice or receipt and it will come up with "Ajax Call Failled"

3: How does the promo feature woeks? Is it possible to order10% reduction in prices as a promo to affect all or limited products?

Note: I have backed up database and files from Cpanel, deleted old database from phpMyAdmin, created new one and did new installation. After, restored the backup files today and after a while, the issue came up again.

Attached is the server log to help in quick resolution.