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OKay, so Corel Painter 2015, is just software (although very in-depth virtual painting software)......and really would not be affected by a router change. You dont even need internet to use Corel Painter.
So, can you tell me MORE about the STRANGE things you mentioned? I need some details to work from.
You also mentioned that you reloaded your printer information........what do you mean? Be specific please.