Touch off, OK button greyed out

Since 2.9.5 update, touch off, the OK button greyed out, after input a value. Also after some restart of PC. A (senseless) touchoff with zero works:


 
 

That was not helpful. Now it's off the no reply list without solution.
As mentioned, any input but zero greys out the ok button. The real machine and sim in Virtualbox have the same issue.
In the dialogbox it says:  file not open
A gcode file is loaded, so this could point to an internal fault
 

The same her with 2.9.5 on my real machine and simulation. I went back to 2.9.4.

Best bet guys, since this an official release is to go to GitHub and raise an issue.
As it is there should be no "kinks".
Just out of interest does inputting 0.0 or some other variation work ? Just a guess .

Had a look again, in the sim. When enter the first number or decimal point, 'file not open apears' in the dialog box.
When i delete all content of the input field, another message:

 

I know this may not help you, but there does seem to be some modifications to touch off in Axis, this was just a quick glance at the history. I'm hoping this is not a locale based issue, when I get a chance I'll create a virtual machine and since I'm English only (not bilingual English is difficult enough for my small intellect) I'll see if I get the same results. The locale thing is just a guess, maybe even an unfounded opinionated speculation.

The Axis touch-off allows for any valid G-code expression, including the use of parameters. (So you should be able to type [#<_x> / 2] for example, to save typing the current X position)

Given this, "bad number format" is not a bug, but "file not found" is.

github.com/LinuxCNC/linuxcnc/issues/3563

What is the best way to move from 2.9.5 back to 2.9.4?

Uninstall 2.9.5

Manually download the 2.9.4 deb files using gdebi.

Or you can follow the instructions here:
gist.github.com/cgomesu/70b41cfde804d4a2981029f9f71f8908


Do I need to say use Linuxcnc as your package