amazingchestahead: You can upload your save to Mediafire then give me the download link. But try something simple first. Load a save before Dermin appears, pause the game, then open the console (CTRL+SPACE) and copypaste this line in and hit Enter:
CLUAConsole:SetGlobal("JaheiraBanditPlot","GLOBAL",9)
Copy this with CTRL+C and paste it in the console with CTRL+V; you don't have to type it.
Setting the variable JaheiraBanditPlot to 9 prevents the dialog line you mentioned from being triggered again. See what happens.
It works! Thank you so much.