The new version 2.6.16 is not saving any macros. I downgraded to 2.6.15 and its all ok now!

Same issue here and it is producing an LUA error when you try to save.

Message: Interface\AddOns\GSE\API\Translator.lua:726: Usage: FindBaseSpellNameByID(spellID) Time: Mon Oct 19 02:34:32 2020 Count: 3 Stack: Interface\AddOns\GSE\API\Translator.lua:726: Usage: FindBaseSpellNameByID(spellID) [string "=[C]"]: in function FindBaseSpellByID'
[string "@interface\AddOns\GSE\API\Translator.lua"]:726: in function GetSpellId' [string "@Interface\AddOns\GSE\API\Translator.lua"]:254: in function TranslateSpell'
[string "@interface\AddOns\GSE\API\Translator.lua"]:236: in function TranslateSpell' [string "@Interface\AddOns\GSE\API\Translator.lua"]:138: in function TranslateString'
[string "@interface\AddOns\GSE\API\Translator.lua"]:16: in function TranslateSequence' [string "@Interface\AddOns\GSE_GUI\GUIFunctions.lua"]:127: in function GUIUpdateSequenceDefinition'
[string "@interface\AddOns\GSE_GUI\Editor.lua"]:247: in function <Interface\AddOns\GSE_GUI\Editor.lua:231>
[string "=[C]"]: ?
[string "@interface\AddOns\ArkInventory\Externals\Ace3\AceGUI\AceGUI-3.0.lua"]:72: in function <...ns\ArkInventory\Externals\Ace3\AceGUI\AceGUI-3.0.lua:70>
[string "@interface\AddOns\ArkInventory\Externals\Ace3\AceGUI\AceGUI-3.0.lua"]:306: in function `Fire'
[string "@interface\AddOns\ArkInventory\Externals\Ace3\AceGUI\widgets\AceGUIWidget-Button.lua"]:22: in function <...xternals\Ace3\AceGUI\widgets\AceGUIWidget-Button.lua:19>

Locals: `

I was trying to make a change to a macro. Didn't seem to matter what I typed it wouldn't save and gave the error, but my last change was this:

/cast Berserking

Same problem here.
I don't get any error messages, but GSE isn't saving anything:

• Changes to existing macros (adding a spell, removing a spell, adding a second version of the macro)
• Creating a new macro

Already disabled all other addons and deleted WTF. Issue is still there.

Importing macros on the other hand works just fine.

Hello there Timothy.

Cannot save macros with all my characters.

I noticed when changing tabs sometimes SAVES ok ( with message changes has been saved )

Login out-in does not solve the problem.

Rolling back to 2.6.15 ( as stated on OP ), it does solve the problem

I can not get this to occur but apparently markofit in the forums had issues saving this:

Hey Tim, there is an issue in 2.6.16, that I cannot save any changes in new macros loaded from this server.

Edit//
ok its weird. Its something in this code I cannot save:
/targetenemy [noharm][dead]
/castsequence [nochanneling] reset=target/combat Agony, Corruption, Unstable Affliction, Siphon Life, null
/cast [mod:alt] Malefic Rapture
/cast [mod:shift, nochanneling] Dark Soul: Misery

Turned out to be Dark Soul: Misery and was caused by #724 update to GetBaseSpellByID

is it fixed then? for. all the clases?

i want to try in few clases the New feature with the Last versión prefix SS

thank you

The prefix is $$ rather than SS but try 2.617 - it should be on curseforge by now and should be fixed for all classes and spells