We are running an application under Citrix XP and were having problems with the screen flickering and jumping. We corrected this by turning on speed screen latency for each client and all was well. Well until we resently installed service pack 3, now the screens flicker again and nothing I seem to do changes the application appearence (reduced client colors to 16, switched bitmap caching off, etc.). I have contacted the vendor of the application and they feel this is a Citrix issue (They support published apps. under Citrix).