NewGuy

Works fine here now, also. The cause must indeed have been an error in PaintDotNet.exe.config . Anyway, thanks for your time.

Running PdN 4.2.9 in portable mode by placing <add key="PaintDotNet.EnablePortableMode" value="true"/> in PaintDotNet.exe.config results in the error message below. Without the PaintDotNet.EnablePortableMode key PdN runs perfectly. PdN 4.2.8 does not have this problem.