Occasionally when using PixelMath, the PixelMath expression editor window will not allow me to enter any text from the keyboard. I am not sure if I am somehow not using the tool correctly, but occasionally clicking the 'Edit' button from the PixelMath window for the 'R/K', 'G', 'B' will open up the expression editor window but not allow any inputs from the keyboard. If I close PI and restart it, this behavior usually goes away and I can enter text / numerals into the expression window normally.
I am running PixInsight Core 01.07.05.0779 Starbuck (x86_64) on Mac OS X v.10.7.3.
Thanks,
Kerry