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/Peo, FreeWebSpace.net
I have had invoice and credit issues in Modernbill as well. I still personally prefer WHMCS but am going to have to keep a close eye on the invoices and credits to make sure everything works and hope Matt or WHMCS develop a fix for this issue.
GeekLayer is on it's way to switching to Ubersmith for this same exact reason. Daniel was talking to me about it and I grabbed myself a trial license - Indeed it can be quite confusing and actually quite terrifying at first, but after a few hours of futsing around with it, I've come to love it.