please don't ever use showimg to show text anymore
Hmm, that line of code can't be your problem. Put something else in there along with the #s(server.etmessage) and see if that shows up. (like this)
NPC Code:
showtext 1101,1,1,,,testing if you can see me this is not the problem : ) #s(server.etmessage);
changeimgvis 1101,4;
If it shows up, then there is something wrong with the string (not being read right I suppose). Otherwise something else is breaking before your script even gets to the showtext.