Thank you everyone for your help!!
Sorry for the delay in responding with the requested data. I also verified that the drag and drop mask issue does not happen on my other computers, just my Lenovo i5, 6GB ram laptop.
Here is an example -
4290x2856 greyscale, 1 channel, 32-bit floating point (mask)
4290x2856 RGB color, 3 channels, 32-bit floating point (target image)
I can just deal with it on my laptop I guess, but if you need any other details so that you may be able to create a workaround to help others, please let me know.
Thanks-
Scott P