RoboTask forum

I've been using a variable that I created and
initialized in an internal Basic script for a while with
no problems until today when I decided to try using the
"Set Variable" action. As long as my variable name
starts with a number, the OK button stays grayed out.

Are variable names starting with a number unsupported?
Is it possible for my variables named in this way
through Basic scripts cause any problems when running
tasks?

This is traditional requirement. All programming languages requires that variable names begins from literal symbols:
a..z, A..Z and underline symbol ( _ )

You may name your variables like this:
_1MyVar
_2MyVar
etc.