I'm not being notified anymore about responses to answers or comments to MaplePrimes. I'm assuming that I'm not the only one (?). This has happened before.

A large procedure I made caused me some problems. I finally found the source of the problem.
There seems to be some interaction between the end of parameters marker, $, and the elementwise operation ~.

Consider these 3 versions of essentially the same procedure:

restart;
Q1:=proc(Var::list,$) local n;
  n:=nops(Var);
  print(Var,n);
  proc(var::list)
       subs(Var=~[seq(1..n)],var); #Elementwise
  end proc;
end proc:
Q1([x,y]); #Doesn't work : "invalid expression"
Q2:=proc(Var::list,$) local n;
  n:=nops(Var);
  print(Var,n);
  proc(var::list)
      subs(zip(`=`,Var,[seq(1..n)]),var); # zip
  end proc;
end proc:
Q2([x,y]); #No problem
Q3:=proc(Var::list) local n; #No end of parameters marker $
  n:=nops(Var);
  print(Var,n);
  proc(var::list)
       subs(Var=~[seq(1..n)],var); # Elementwise
  end proc;
end proc:
Q3([x,y]); # No problem
lprint(Q3([x,y])); #Curious output involving ` $`
#A fourth procedure in which the output is not a procedure works:
Q4:=proc(Var::list,$) local n;
  n:=nops(Var);
  print(Var,n);
  subs(Var=~[seq(1..n)],Var)
end proc:
Q4([x,y]);

Does anybody have any comments? Is it a bug?

Any plans of correcting the obvious problem the MaplePrimes text editor has with the inequality sign < ?
It is really quite annoying.
Everything on a line of code after < is very often discarded with the obvious effect that the code doesn't run.

For a while I haven't received notifications about updates to answers and comments from MaplePrimes. Is that due to the recent problem with fake messages from Maple?

I know that I have raised this question before, and also got some responses.

However, I cannot find the thread, and I'm still interested in what is going on.

I don't have a clue.

restart;
f:=proc(a)
plot(sin(x),x=0..Pi);
#plot(x^3,x=0..1);
#plot(undefined,x=0..1);
a^2   
end proc:

#Now try plotting what should be the parabola y = x^2 on the interval -1..1:
plot(f,-1..1,adaptive=false);
plot(f,-1..1);
plot(f(a),a=-1..1);