Yellowjacket + PS2/You LED sign + WiServer = *almost AWESOME* (Out of memory?)

Sure it doesn't work this way, you're freezing your Arduino for 2.5 seconds which is an incredibly long time in network regards. Take a look at the BlinkWithoutDelay example to find out how you can have timed events in the loop without using delay().

//  if(strLength > 1){
//     if(textLength < (X_MAX +1)){
//       fixedText(text);
//       delay(displayTime);
//       disp.clear(); 
//       disp.syncDisplays();
//       delay(gapTime); 
//     }else{
//       scrollText(text); 
//       delay(gapTime);
//     }
//   }
//   nextLine();