Travel website Booking.com has been accused of leaving accommodation hosts in Scotland thousands of pounds out of pocket.
The online platform allows people to book rooms that hotels and individual homeowners advertise on its site.
However, two Scottish hosts told the BBC they have not been paid in months for accommodating guests.
Booking.com said some payments were delayed as a result of planned IT system maintenance.
The Amsterdam-based company blamed "unforeseen technical issues" and said it was urgently working to resume payments for a small number of hosts affected.
Accommodation owners in other parts of the UK and Europe have also been hit by the issue, with one man claiming he is owed about £50,000.
Pays the host
Booking.com takes payment from the customer and then pays the host once it has deducted fees and commission.
Emma Audain, who rents out a flat in Glasgow, said she is owed £3,000 by Booking.com - having not received any payments since June, and is now considering legal action against the company.
She said: "Guests have paid and I'm not sure they will be entirely comfortable to find out this money has been swallowed by Booking.com.
"This is money we use to pay our bills, the cleaners, management fees and the like. We don't want to pass the impact of this onto guests."
Karen Bancroft manages five short-term-let properties in the Nairn area, one of which she owns, and is chasing £3,000 in payments.
'Total nightmare'
She said: "It has been a total nightmare - none of the hosts in my situation are huge corporations so going this long without these payment is really hurting their business.
"Dealing with Booking.com has been really challenging - just trying to get a straight answer has been near impossible.
"This is the guests' money, what have they done with it? I don't think guests will be aware of what is going on."