find bills and find invoices

hello all,

I am using sage 50, no problems until now.

when i try to access "the find bills" or "find invoices" in the payables or receivables module I can't get any info.

when i get to the bill look up window, start date is my present session date sept 30 2018 and the finish date is also my present session date of sept 30 2018. so there is no data. if i try to change the start date, my only option is the first of that month, and if i change it, then i get a window that says "invalid date. start date and finish date must be between sept 30 and sept 30....arg. 

the only thing i did in this session was to delete an inventory item which the system told me to clear inventory tracking data.

any help is appreciated

thanks