Possibly because it is not an update to gSender but an ‘Edge’ version.
@Jens @Ninefingers 1.5.6 is the current release for the production version. It’s 1.6 that is the new Edge. Mind you, gSender doesn’t show the updates for me either. It also doesn’t reconnect to my SLB even though I have it set to reconnect. Too lazy to contact Sienci about it.
Is this over USB or Ethernet? If Ethernet, that is fixed in the next release 
And yes, as mentioned Edge is pre-release software and does not show up on the updater.
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@KGN In 1.4.12, there is a slider labelled rotary/4th axis. With the SLB, this is to be set to 4th axis.
In 1.5.6, that slider is no longer labelled that way. Now it is only labelled rotary. Should this slider be in the off position to indicate that the user wants to choose 4th axis? Meaning, that is now the default condition and the slider is only turn to the on position if the user wants to select rotary??
Thanks.
The behaviour depends on the firmware you’re connected with:
SLB/grblHAL:
Switch options are 4-axis (default) and Rotary.
If off (4-axis, the default) nothing is changed, A is still A and Y is still Y.
If on (Rotary) A is replaced with Y, similar to the vanilla grbl experience, because the assumption is that you are hijacking Y again.
Grbl
For vanilla grbl, 4 axis is not a thing so you can just choose to replace A with Y for the axis hijacking by enabling.
@KGN Tks much, Kevin. That explains why I don’t see the 4th axis option on my test Uno. It is connecting via grbl.