Full screen works for me for Linyx hosted, 64 bit.. Has for years. (Not sure why this isn't a screen mode.) Unfortunately, it doesn't comply with Linux's setting to show the image higher than wide on my sideways screen. The AROSBootstrap shows a few possible arguments, but the fullscreen option is not among them. One wonders whether there are more such options that could influence fullscreen mode.
I don't know how dir inter is supposed to function exactly, but when I ask it for the inter template, by entering question-mark Return, it displays the template twide and goes to the next FS entry. Neither can be right.
As far as I can tell, it really does execute the script; try using a script that itself sets a variable, then after the script ends, check the variable. However, according to the report the output isn't going where it is expected to go. Is the output indeed not going where it should, or is the problem in the expectation? If I backtick Execute scriptname, the output will end up in the shell; if I just backtick scriptname it won't. In neither case providing it as argument to Set appears to actually...
Any idea of when it was still OK?