Same issue occurs with TurboTax Home and Business download version. When 1099-Misc and 1099-NEC self-employment income originally entered under business income section when working on taxes last week, everything seemed fine and both were correctly reported on Schedule C. When I opened the program this week there was a prolonged update and now there is an error message next to 1099-Misc Income  “a link to Schedule C should not be linked when WMP qualifying as difficulty of payment exclusion box has been checked”. However, there is no box on 1099-Misc or W-2 "difficulty of payment exclusion". Seems like this is a glitch in the tax program. If the 1099-Misc is unlinked to the Schedule C it screws up taxes and amount that can be contributed to solo-401K.