Invoice King Pro doesn’t calculate or insert client details

Hey there!

I got another problem with Invoice King Pro. When I create a new invoice and select an existing client and click the “insert client details” button, nothing happens. Also the table with the invoice items doesn’t calculate anymore. I can put in my different positions, individual price and item count but the calculation doesn’t happen in the last column.

Everything worked finde some weeks ago and I haven’t changed anything except maybe a WordPress update which may have happened in between.

Help would be appreciated!